<PAGE>   1

   As filed with the Securities and Exchange Commission on November 20, 1997.

                                                      Registration No. 333-

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                              --------------------

                                    FORM S-8
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                              --------------------

                          CONCORD COMMUNICATIONS, INC.
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                                                     <C>
                       Massachusetts                                                  04-2710876
(State or other jurisdiction of incorporation or organization)          (I.R.S. Employer Identification No.)
</TABLE>

                            33 Boston Post Road West
                          Marlboro, Massachusetts 01752
                                 (508) 460-4646
               (Address of Principal Executive Offices) (Zip Code)

                              --------------------

                                 1995 Stock Plan
                                 1997 Stock Plan
                  1997 Non-Employee Director Stock Option Plan
                            (Full title of the plans)

                              --------------------

                                 John A. Blaeser
                      Chief Executive Officer and President
                          Concord Communications, Inc.
                            33 Boston Post Road West
                          Marlboro, Massachusetts 01752
                                 (508) 460-4646
           (Name and address including zip code and telephone number,
                   including area code, of agent for service)

                              --------------------

                                    Copy to:
                           Edwin L. Miller, Jr., Esq.
                         TESTA, HURWITZ & THIBEAULT, LLP
                       High Street Tower, 125 High Street
                           Boston, Massachusetts 02110
                                 (617) 248-7000

         Approximate date of commencement of proposed sale to the public: As
soon as practicable after this Registration Statement becomes effective.

                              --------------------

================================================================================


<PAGE>   2


                                       -2-

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
============================================================================================================

                                                                 Proposed         Proposed
                                                                  Maximum         Maximum
                                                 Amount          Offering        Aggregate      Amount of
Title of Securities                               to be          Price Per        Offering     Registration
to be Registered                               Registered          Share           Price           Fee
------------------------------------------------------------------------------ -----------------------------

<S>                                             <C>              <C>            <C>               <C>   
1995 STOCK PLAN
Common Stock (Par Value $.01 Per Share)         1,226,703        $ 0.10(1)      $   122,671       $   38
Common Stock (Par Value $.01 Per Share)            48,125        $ 0.40(1)      $    19,250       $    6
Common Stock (Par Value $.01 Per Share)           162,625        $ 0.90(1)      $   146,363       $   45
Common Stock (Par Value $.01 Per Share)           260,375        $ 1.90(1)      $   494,713       $  150
Common Stock (Par Value $.01 Per Share)           226,650        $ 4.10(1)      $   929,265       $  282
Common Stock (Par Value $.01 Per Share)            54,000        $ 6.00(1)      $   324,000       $   99
Common Stock (Par Value $.01 Per Share)            12,500        $ 7.50(1)      $    93,750       $   29
Common Stock (Par Value $.01 Per Share)             2,750        $ 8.50(1)      $    23,375       $    8
Common Stock (Par Value $.01 Per Share)             2,000        $10.00(1)      $    20,000       $    7
Common Stock (Par Value $.01 Per Share)           699,508        $21.25(2)      $14,864,545       $4,505
                                                                                                
1997 STOCK PLAN                                                                                 
Common Stock (Par Value $.01 Per Share)           597,000        $21.25(2)      $12,686,250       $3,845
Common Stock (Par Value $.01 Per Share)           150,000        $18.88(1)      $ 2,832,000       $  859
Common Stock (Par Value $.01 Per Share)             2,000        $20.00(1)      $    40,000       $   13
Common Stock (Par Value $.01 Per Share)             1,000        $21.38(1)      $    21,380       $    7
                                                                                               
1997 NON-EMPLOYEE DIRECTOR STOCK 
OPTION PLAN                                                                              
Common Stock (Par Value $.01 Per Share)            95,000        $21.25(2)      $ 2,018,750       $   612
                                                                                               
TOTAL:                                          3,540,236                                         $10,505

------------------------------------------------------------------------------------------------------------
</TABLE>

(1)  All such shares are issuable upon exercise of outstanding options with
     fixed exercise prices. Pursuant to Regulation C, Rule 457(h)(1) under the
     Securities Act of 1933, as amended, the aggregate offering price and the
     fee have been computed upon the basis of the price at which the options may
     be exercised.

(2)  The price of $21.25 per share, which is the average of the high and low
     prices of the common stock of the registrant reported on the Nasdaq
     National Market on November 14, 1997, is set forth solely for purposes of
     calculating the filing fee pursuant to Rule 457(c) and (h) and has been
     used only for those shares without a fixed exercise price.


<PAGE>   3


                                       -3-


                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS

Item 1.  PLAN INFORMATION.

         The documents containing the information specified in this Item 1 will
be sent or given to employees, directors or others as specified by Rule
428(b)(1). In accordance with the rules and regulations of the Securities and
Exchange Commission (the "Commission") and the instructions to Form S-8, such
documents are not being filed with the Commission either as part of this
Registration Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

Item 2.  REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION.

         The documents containing the information specified in this Item 2 will
be sent or given to employees as specified by Rule 428(b)(1). In accordance with
the rules and regulations of the Commission and the instructions to Form S-8,
such documents are not being filed with the Commission either as part of this
Registration Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents filed with the Commission are incorporated by
reference in this Registration Statement:

         (a)     Registrant's Prospectus dated October 15, 1997 as filed with
                 the Commission pursuant to Rule 424(b)(1) of the Securities Act
                 of 1933, as amended (the "Securities Act"), on October 16,
                 1997; and

         (b)     The section entitled "Description of Registrant's Securities to
                 be Registered," contained in the Registrant's Registration
                 Statement on Form 8-A, filed on September 12, 1997 pursuant to
                 Section 12(g) of the Securities Exchange Act of 1934, as
                 amended (the "Exchange Act").

         All documents subsequently filed with the Commission by the Registrant
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to
the filing of a post-effective amendment which indicates that all securities
offered herein have been sold or which deregisters all securities then remaining
unsold, shall be deemed to be incorporated by reference in this Registration
Statement and to be a part hereof from the date of filing of such documents.

Item 4.  DESCRIPTION OF SECURITIES.

         Not applicable.




<PAGE>   4
                                      -4-


Item 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

         Not applicable.

Item 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The Restated Articles of Organization of the Company and the Restated
By-Laws provide for indemnification of the Company's directors and officers
unless such indemnification is prohibited by the Massachusetts Business
Corporation Law. The Massachusetts Business Corporation Law generally permits
indemnification of the Company's directors and officers for liabilities and
expenses that they may incur in such capacities, except with respect to any
matter that the indemnified person shall have been adjudicated in any proceeding
not to have acted in good faith in the reasonable belief that his or her action
was in the best interest of the Company. Reference is made to the Company's
corporate charter filed as Exhibit 3.02 to the Company's Registration Statement
on Form S-1 filed with the Commission on August 8, 1997, as amended (the "S-1")
and Restated By-Laws filed as Exhibit 3.03 to the Company's S-1.

         The Underwriting Agreement provides that the Underwriters are
obligated, under certain circumstances, to indemnify directors, officers and
controlling persons of the Company against certain liabilities, including
liabilities under the Securities Act. Reference is made to the form of
Underwriting Agreement filed as Exhibit 1.01 to the Company's S-1.

         Pursuant to an agreement between Charles River Partnership VII Limited
Partnership and Mr. Richard M. Burnes, Jr., Charles River Partnership VII has
agreed to indemnify Mr. Burnes against any liability incurred in his capacity as
a director of the Company.

         The Company has entered into indemnification agreements with its
directors and officers and has obtained directors and officers liability
insurance for the benefit of its directors and officers.

Item 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not applicable.

Item 8.  EXHIBITS.

         Exhibit No.           Description of Exhibit
         -----------           ----------------------

         Exhibit 5.1           Opinion of Testa, Hurwitz & Thibeault, LLP 
                               (filed herewith).

         Exhibit 23.1          Consent of Testa, Hurwitz & Thibeault, LLP 
                               (contained in Exhibit 5.1).

         Exhibit 23.2          Consent of Arthur Andersen LLP (filed herewith).

         Exhibit 24.1          Power of Attorney (included as part of the
                               signature page to this Registration Statement).

<PAGE>   5
                                      -5-


Item 9.  UNDERTAKINGS.

         (a)     The undersigned registrant hereby undertakes:

                 (1)      To file, during any period in which offers or sales
                          are being made, a post-effective amendment to this
                          Registration Statement:

                          (i)     To include any prospectus required by Section
                                  10(a)(3) of the Securities Act of 1933;

                          (ii)    To reflect in the prospectus any facts or
                                  events arising after the effective date of the
                                  Registration Statement (or the most recent
                                  post-effective amendment thereof) which,
                                  individually or in the aggregate, represent a
                                  fundamental change in the information set
                                  forth in the Registration Statement.
                                  Notwithstanding the foregoing, any increase or
                                  decrease in volume of securities offered (if
                                  the total dollar value of securities offered
                                  would not exceed that which was registered)
                                  and any deviation from the low or high and of
                                  the estimated maximum offering range may be
                                  reflected in the form of prospectus filed with
                                  the Commission pursuant to Rule 424(b) if, in
                                  the aggregate, the changes in volume and price
                                  represent no more than 20 percent change in
                                  the maximum aggregate offering price set forth
                                  in the "Calculation of Registration Fee" table
                                  in the Registration Statement;

                          (iii)   To include any material information with
                                  respect to the plan of distribution not
                                  previously disclosed in the Registration
                                  Statement or any material change to such
                                  information in the Registration Statement;


                 (2)      That, for the purpose of determining any liability
                          under the Securities Act of 1933, each such
                          post-effective amendment shall be deemed to be a new
                          Registration Statement relating to the securities
                          offered therein, and the offering of such securities
                          at that time shall be deemed to be the initial bona
                          fide offering thereof.

                 (3)      To remove from registration by means of a
                          post-effective amendment any of the securities being
                          registered which remain unsold at the termination of
                          the offering.

         (b)     The undersigned Registrant hereby undertakes that, for purposes
                 of determining any liability under the Securities Act of 1933,
                 each filing of the Registrant's annual report pursuant to
                 Section 13(a) or Section 15(d) of the Securities Exchange Act
                 of 1934 (and, where applicable, each filing of an employee
                 benefit plan's annual report pursuant to Section 15(d) of the
                 Securities Exchange Act of 1934) that is incorporated by
                 reference in the Registration Statement shall be deemed to be a
                 new registration statement relating to the securities offered
                 therein, and the offering of such securities at that time shall
                 be deemed to be the initial bona fide offering thereof.

         (c)     Insofar as indemnification for liabilities arising under the
                 Securities Act of 1933 may be permitted to directors, officers
                 and controlling persons of the Registrant pursuant to the
                 foregoing provisions, or otherwise, the Registrant has been
                 advised that in the opinion of 

<PAGE>   6

                                      -6-


                 the Securities and Exchange Commission such indemnification is
                 against public policy as expressed in the Securities Act of
                 1933 and is, therefore, unenforceable. In the event that a
                 claim for indemnification against such liabilities (other than
                 the payment by the Registrant of expenses incurred or paid by a
                 director, officer or controlling person of the Registrant in
                 the successful defense of any action, suit or proceeding) is
                 asserted by such director, officer or controlling person in
                 connection with the securities being registered, the Registrant
                 will, unless in the opinion of its counsel the matter has been
                 settled by controlling precedent, submit to a court of
                 appropriate jurisdiction the question whether such
                 indemnification by it is against public policy as expressed in
                 the Act and will be governed by the final adjudication of such
                 issue.


                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


<PAGE>   7

                                      -7-


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Concord Communications, Inc., certifies that it has reasonable
grounds to believe that it meets all of the requirements for filing on Form S-8
and has duly caused this Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the Town of Marlboro,
Commonwealth of Massachusetts, on this 20th day of November, 1997.

                                    CONCORD COMMUNICATIONS, INC.

                                    By: /s/ John A. Blaeser
                                        ----------------------------------------
                                        John A. Blaeser
                                        Chief Executive Officer and President


                                POWER OF ATTORNEY

         We, the undersigned officers and directors of Concord Communications,
Inc., hereby severally constitute and appoint John A. Blaeser and Gary E.
Haroian, and each of them singly, our true and lawful attorneys, with full power
to them and each of them singly, to sign for us in our names in the capacities
indicated below, any amendments to this Registration Statement on Form S-8
(including post-effective amendments), and to file the same, with all exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, and generally to do all things in our names and on our
behalf in our capacities as officers and directors to enable Concord
Communications, Inc., to comply with the provisions of the Securities Act of
1933, as amended, hereby ratifying and confirming our signatures as they may be
signed by our said attorneys, or any of them, to said Registration Statement and
all amendments thereto.
         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.


<TABLE>
<CAPTION>
           SIGNATURE                             TITLE(S)                                 DATE
           ---------                             --------                                 ----

<S>                                 <C>                                             <C> 
/s/ John A. Blaeser                 Chief Executive Officer, President and          November 20, 1997
------------------------------      Director (Principal Executive Officer)
John A. Blaeser

/s/ Gary E. Haroian                 Vice President, Finance and Administration,     November 20, 1997
------------------------------      Chief Financial Officer, Clerk and Treasurer 
Gary E. Haroian                     (Principal Financial and Accounting Officer)          

/s/ Frederick W. W. Bolander        Director                                        November 20, 1997
------------------------------
Frederick W. W. Bolander          

/s/ Richard M. Burnes, Jr.          Director                                        November 20, 1997
------------------------------    
Richard M. Burnes, Jr.            

/s/ Robert C. Hawk                  Director                                        November 20, 1997
------------------------------    
Robert C. Hawk                    

/s/ John Robert Held                Director                                        November 20, 1997
------------------------------    
John Robert Held                  

/s/ Deepak Kamra                    Director                                        November 20, 1997
------------------------------
Deepak Kamra                      

/s/ Robert M. Wadsworth             Director                                        November 20, 1997
------------------------------    
Robert M. Wadsworth            
</TABLE>


<PAGE>   8



                                  EXHIBIT INDEX



Exhibit No.                  Description of Exhibit                  Page Number
-----------                  ----------------------                  -----------

    5.1       Opinion of Testa, Hurwitz & Thibeault, LLP

   23.1       Consent of Testa, Hurwitz & Thibeault, LLP 
              (contained in Exhibit 5.1)

   23.2       Consent of Arthur Andersen LLP

   24.1       Power of Attorney (included as part of the signature 
              page to this Registration Statement)
[{"type": "S-8", "sequence": "1", "description": "CONCORD COMMUNICATIONS, INC.", "secsgml_size_bytes": 22021}]
{"company-data": {"conformed-name": "CONCORD COMMUNICATIONS INC", "cik": "0000915290", "assigned-sic": "3669", "irs-number": "042710876", "state-of-incorporation": "MA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-40645", "film-number": "97725072"}, "business-address": {"street1": "33 BOSTON POST ROAD WEST", "city": "MARLBORO", "state": "MA", "zip": "01752", "phone": "5084604646"}, "mail-address": {"street1": "33 BOSTON POST ROAD WEST", "city": "MARLBORO", "state": "MA", "zip": "01752"}}
1

   As filed with the Securities and Exchange Commission on November 20, 1997.

                                                      Registration No. 333-

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                              --------------------

                                    FORM S-8
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                              --------------------

                          CONCORD COMMUNICATIONS, INC.
             (Exact name of registrant as specified in its charter)
Massachusetts                                                  04-2710876
(State or other jurisdiction of incorporation or organization)          (I.R.S. Employer Identification No.)
33 Boston Post Road West
                          Marlboro, Massachusetts 01752
                                 (508) 460-4646
               (Address of Principal Executive Offices) (Zip Code)

                              --------------------

                                 1995 Stock Plan
                                 1997 Stock Plan
                  1997 Non-Employee Director Stock Option Plan
                            (Full title of the plans)

                              --------------------

                                 John A. Blaeser
                      Chief Executive Officer and President
                          Concord Communications, Inc.
                            33 Boston Post Road West
                          Marlboro, Massachusetts 01752
                                 (508) 460-4646
           (Name and address including zip code and telephone number,
                   including area code, of agent for service)

                              --------------------

                                    Copy to:
                           Edwin L. Miller, Jr., Esq.
                         TESTA, HURWITZ & THIBEAULT, LLP
                       High Street Tower, 125 High Street
                           Boston, Massachusetts 02110
                                 (617) 248-7000

         Approximate date of commencement of proposed sale to the public: As
soon as practicable after this Registration Statement becomes effective.

                              --------------------

================================================================================
2

                                       -2-

                         CALCULATION OF REGISTRATION FEE
============================================================================================================

                                                                 Proposed         Proposed
                                                                  Maximum         Maximum
                                                 Amount          Offering        Aggregate      Amount of
Title of Securities                               to be          Price Per        Offering     Registration
to be Registered                               Registered          Share           Price           Fee
------------------------------------------------------------------------------ -----------------------------
1995 STOCK PLAN
Common Stock (Par Value $.01 Per Share)         1,226,703        $ 0.10(1)      $   122,671       $   38
Common Stock (Par Value $.01 Per Share)            48,125        $ 0.40(1)      $    19,250       $    6
Common Stock (Par Value $.01 Per Share)           162,625        $ 0.90(1)      $   146,363       $   45
Common Stock (Par Value $.01 Per Share)           260,375        $ 1.90(1)      $   494,713       $  150
Common Stock (Par Value $.01 Per Share)           226,650        $ 4.10(1)      $   929,265       $  282
Common Stock (Par Value $.01 Per Share)            54,000        $ 6.00(1)      $   324,000       $   99
Common Stock (Par Value $.01 Per Share)            12,500        $ 7.50(1)      $    93,750       $   29
Common Stock (Par Value $.01 Per Share)             2,750        $ 8.50(1)      $    23,375       $    8
Common Stock (Par Value $.01 Per Share)             2,000        $10.00(1)      $    20,000       $    7
Common Stock (Par Value $.01 Per Share)           699,508        $21.25(2)      $14,864,545       $4,505
                                                                                                
1997 STOCK PLAN                                                                                 
Common Stock (Par Value $.01 Per Share)           597,000        $21.25(2)      $12,686,250       $3,845
Common Stock (Par Value $.01 Per Share)           150,000        $18.88(1)      $ 2,832,000       $  859
Common Stock (Par Value $.01 Per Share)             2,000        $20.00(1)      $    40,000       $   13
Common Stock (Par Value $.01 Per Share)             1,000        $21.38(1)      $    21,380       $    7
                                                                                               
1997 NON-EMPLOYEE DIRECTOR STOCK 
OPTION PLAN                                                                              
Common Stock (Par Value $.01 Per Share)            95,000        $21.25(2)      $ 2,018,750       $   612
                                                                                               
TOTAL:                                          3,540,236                                         $10,505

------------------------------------------------------------------------------------------------------------
(1)  All such shares are issuable upon exercise of outstanding options with
     fixed exercise prices. Pursuant to Regulation C, Rule 457(h)(1) under the
     Securities Act of 1933, as amended, the aggregate offering price and the
     fee have been computed upon the basis of the price at which the options may
     be exercised.

(2)  The price of $21.25 per share, which is the average of the high and low
     prices of the common stock of the registrant reported on the Nasdaq
     National Market on November 14, 1997, is set forth solely for purposes of
     calculating the filing fee pursuant to Rule 457(c) and (h) and has been
     used only for those shares without a fixed exercise price.
3

                                       -3-

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS

Item 1.  PLAN INFORMATION.

         The documents containing the information specified in this Item 1 will
be sent or given to employees, directors or others as specified by Rule
428(b)(1). In accordance with the rules and regulations of the Securities and
Exchange Commission (the "Commission") and the instructions to Form S-8, such
documents are not being filed with the Commission either as part of this
Registration Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

Item 2.  REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION.

         The documents containing the information specified in this Item 2 will
be sent or given to employees as specified by Rule 428(b)(1). In accordance with
the rules and regulations of the Commission and the instructions to Form S-8,
such documents are not being filed with the Commission either as part of this
Registration Statement or as prospectuses or prospectus supplements pursuant to
Rule 424.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents filed with the Commission are incorporated by
reference in this Registration Statement:

         (a)     Registrant's Prospectus dated October 15, 1997 as filed with
                 the Commission pursuant to Rule 424(b)(1) of the Securities Act
                 of 1933, as amended (the "Securities Act"), on October 16,
                 1997; and

         (b)     The section entitled "Description of Registrant's Securities to
                 be Registered," contained in the Registrant's Registration
                 Statement on Form 8-A, filed on September 12, 1997 pursuant to
                 Section 12(g) of the Securities Exchange Act of 1934, as
                 amended (the "Exchange Act").

         All documents subsequently filed with the Commission by the Registrant
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to
the filing of a post-effective amendment which indicates that all securities
offered herein have been sold or which deregisters all securities then remaining
unsold, shall be deemed to be incorporated by reference in this Registration
Statement and to be a part hereof from the date of filing of such documents.

Item 4.  DESCRIPTION OF SECURITIES.

         Not applicable.
4
                                      -4-

Item 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

         Not applicable.

Item 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The Restated Articles of Organization of the Company and the Restated
By-Laws provide for indemnification of the Company's directors and officers
unless such indemnification is prohibited by the Massachusetts Business
Corporation Law. The Massachusetts Business Corporation Law generally permits
indemnification of the Company's directors and officers for liabilities and
expenses that they may incur in such capacities, except with respect to any
matter that the indemnified person shall have been adjudicated in any proceeding
not to have acted in good faith in the reasonable belief that his or her action
was in the best interest of the Company. Reference is made to the Company's
corporate charter filed as Exhibit 3.02 to the Company's Registration Statement
on Form S-1 filed with the Commission on August 8, 1997, as amended (the "S-1")
and Restated By-Laws filed as Exhibit 3.03 to the Company's S-1.

         The Underwriting Agreement provides that the Underwriters are
obligated, under certain circumstances, to indemnify directors, officers and
controlling persons of the Company against certain liabilities, including
liabilities under the Securities Act. Reference is made to the form of
Underwriting Agreement filed as Exhibit 1.01 to the Company's S-1.

         Pursuant to an agreement between Charles River Partnership VII Limited
Partnership and Mr. Richard M. Burnes, Jr., Charles River Partnership VII has
agreed to indemnify Mr. Burnes against any liability incurred in his capacity as
a director of the Company.

         The Company has entered into indemnification agreements with its
directors and officers and has obtained directors and officers liability
insurance for the benefit of its directors and officers.

Item 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not applicable.

Item 8.  EXHIBITS.

         Exhibit No.           Description of Exhibit
         -----------           ----------------------

         Exhibit 5.1           Opinion of Testa, Hurwitz & Thibeault, LLP 
                               (filed herewith).

         Exhibit 23.1          Consent of Testa, Hurwitz & Thibeault, LLP 
                               (contained in Exhibit 5.1).

         Exhibit 23.2          Consent of Arthur Andersen LLP (filed herewith).

         Exhibit 24.1          Power of Attorney (included as part of the
                               signature page to this Registration Statement).
5
                                      -5-

Item 9.  UNDERTAKINGS.

         (a)     The undersigned registrant hereby undertakes:

                 (1)      To file, during any period in which offers or sales
                          are being made, a post-effective amendment to this
                          Registration Statement:

                          (i)     To include any prospectus required by Section
                                  10(a)(3) of the Securities Act of 1933;

                          (ii)    To reflect in the prospectus any facts or
                                  events arising after the effective date of the
                                  Registration Statement (or the most recent
                                  post-effective amendment thereof) which,
                                  individually or in the aggregate, represent a
                                  fundamental change in the information set
                                  forth in the Registration Statement.
                                  Notwithstanding the foregoing, any increase or
                                  decrease in volume of securities offered (if
                                  the total dollar value of securities offered
                                  would not exceed that which was registered)
                                  and any deviation from the low or high and of
                                  the estimated maximum offering range may be
                                  reflected in the form of prospectus filed with
                                  the Commission pursuant to Rule 424(b) if, in
                                  the aggregate, the changes in volume and price
                                  represent no more than 20 percent change in
                                  the maximum aggregate offering price set forth
                                  in the "Calculation of Registration Fee" table
                                  in the Registration Statement;

                          (iii)   To include any material information with
                                  respect to the plan of distribution not
                                  previously disclosed in the Registration
                                  Statement or any material change to such
                                  information in the Registration Statement;

                 (2)      That, for the purpose of determining any liability
                          under the Securities Act of 1933, each such
                          post-effective amendment shall be deemed to be a new
                          Registration Statement relating to the securities
                          offered therein, and the offering of such securities
                          at that time shall be deemed to be the initial bona
                          fide offering thereof.

                 (3)      To remove from registration by means of a
                          post-effective amendment any of the securities being
                          registered which remain unsold at the termination of
                          the offering.

         (b)     The undersigned Registrant hereby undertakes that, for purposes
                 of determining any liability under the Securities Act of 1933,
                 each filing of the Registrant's annual report pursuant to
                 Section 13(a) or Section 15(d) of the Securities Exchange Act
                 of 1934 (and, where applicable, each filing of an employee
                 benefit plan's annual report pursuant to Section 15(d) of the
                 Securities Exchange Act of 1934) that is incorporated by
                 reference in the Registration Statement shall be deemed to be a
                 new registration statement relating to the securities offered
                 therein, and the offering of such securities at that time shall
                 be deemed to be the initial bona fide offering thereof.

         (c)     Insofar as indemnification for liabilities arising under the
                 Securities Act of 1933 may be permitted to directors, officers
                 and controlling persons of the Registrant pursuant to the
                 foregoing provisions, or otherwise, the Registrant has been
                 advised that in the opinion of
6

                                      -6-

                 the Securities and Exchange Commission such indemnification is
                 against public policy as expressed in the Securities Act of
                 1933 and is, therefore, unenforceable. In the event that a
                 claim for indemnification against such liabilities (other than
                 the payment by the Registrant of expenses incurred or paid by a
                 director, officer or controlling person of the Registrant in
                 the successful defense of any action, suit or proceeding) is
                 asserted by such director, officer or controlling person in
                 connection with the securities being registered, the Registrant
                 will, unless in the opinion of its counsel the matter has been
                 settled by controlling precedent, submit to a court of
                 appropriate jurisdiction the question whether such
                 indemnification by it is against public policy as expressed in
                 the Act and will be governed by the final adjudication of such
                 issue.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]
7

                                      -7-

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Concord Communications, Inc., certifies that it has reasonable
grounds to believe that it meets all of the requirements for filing on Form S-8
and has duly caused this Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the Town of Marlboro,
Commonwealth of Massachusetts, on this 20th day of November, 1997.

                                    CONCORD COMMUNICATIONS, INC.

                                    By: /s/ John A. Blaeser
                                        ----------------------------------------
                                        John A. Blaeser
                                        Chief Executive Officer and President

                                POWER OF ATTORNEY

         We, the undersigned officers and directors of Concord Communications,
Inc., hereby severally constitute and appoint John A. Blaeser and Gary E.
Haroian, and each of them singly, our true and lawful attorneys, with full power
to them and each of them singly, to sign for us in our names in the capacities
indicated below, any amendments to this Registration Statement on Form S-8
(including post-effective amendments), and to file the same, with all exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, and generally to do all things in our names and on our
behalf in our capacities as officers and directors to enable Concord
Communications, Inc., to comply with the provisions of the Securities Act of
1933, as amended, hereby ratifying and confirming our signatures as they may be
signed by our said attorneys, or any of them, to said Registration Statement and
all amendments thereto.
         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.
SIGNATURE                             TITLE(S)                                 DATE
           ---------                             --------                                 ----
/s/ John A. Blaeser                 Chief Executive Officer, President and          November 20, 1997
------------------------------      Director (Principal Executive Officer)
John A. Blaeser

/s/ Gary E. Haroian                 Vice President, Finance and Administration,     November 20, 1997
------------------------------      Chief Financial Officer, Clerk and Treasurer 
Gary E. Haroian                     (Principal Financial and Accounting Officer)          

/s/ Frederick W. W. Bolander        Director                                        November 20, 1997
------------------------------
Frederick W. W. Bolander          

/s/ Richard M. Burnes, Jr.          Director                                        November 20, 1997
------------------------------    
Richard M. Burnes, Jr.            

/s/ Robert C. Hawk                  Director                                        November 20, 1997
------------------------------    
Robert C. Hawk                    

/s/ John Robert Held                Director                                        November 20, 1997
------------------------------    
John Robert Held                  

/s/ Deepak Kamra                    Director                                        November 20, 1997
------------------------------
Deepak Kamra                      

/s/ Robert M. Wadsworth             Director                                        November 20, 1997
------------------------------    
Robert M. Wadsworth
8

                                  EXHIBIT INDEX

Exhibit No.                  Description of Exhibit                  Page Number
-----------                  ----------------------                  -----------

    5.1       Opinion of Testa, Hurwitz & Thibeault, LLP

   23.1       Consent of Testa, Hurwitz & Thibeault, LLP 
              (contained in Exhibit 5.1)

   23.2       Consent of Arthur Andersen LLP

   24.1       Power of Attorney (included as part of the signature 
              page to this Registration Statement)