<PAGE>   1
                         This Exhibit Index is on page 7
    As filed with the Securities and Exchange Commission on January 28, 2000
                       Registration No. 333-_____________

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                              MICROS SYSTEMS, INC.
               (Exact name of issuer as specified in its charter)

<TABLE>
<CAPTION>
                          MARYLAND                                                     52-1101488
                          --------                                                     ----------
<S>                                                                       <C>
              (State or other jurisdiction of                             (I.R.S. Employer Identification No.)
              incorporation or organization)

            12000 Baltimore Avenue                                                     20705-1291
            Beltsville, Maryland                                                       (Zip Code)
            (Address of principal executive offices)
</TABLE>

                   MICROS SYSTEMS, INC. 1991 STOCK OPTION PLAN
                   -------------------------------------------
                      (Effective as of September 23, 1991)
                              (Full title of plan)

<TABLE>
<CAPTION>

(Name, address and telephone                                            (Copies to:)
number of agent for service)
<S>                                                                     <C>
                                                                        ANTHONY J. RICKERT, ESQUIRE
A. L. GIANNOPOULOS                                                      JANE TAM, ESQUIRE
12000 BALTIMORE AVENUE                                                  PIPER MARBURY RUDNICK & WOLFE L.L.P.
BELTSVILLE, MARYLAND  20705-1291                                        1200 19TH STREET
(301) 210-6000                                                          WASHINGTON, D.C.  20036
</TABLE>

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------
                                            Proposed maximum          Proposed maximum         Amount of
Title of securities      Amount to be       offering price            aggregate offering       registration
 to be registered        registered         per share                 price                    fee
-----------------------------------------------------------------------------------------------------------
<S>                      <C>                <C>                       <C>                      <C>
Common Stock (par        1,000,000          $61.46875*                $61,468,750*             $16,227.75*
value $0.25 per share)
</TABLE>

================================================================================
* Calculated solely for purposes of calculating the registration fee pursuant to
Rule 457 (h) and (c), the proposed maximum offering price per share, proposed
maximum aggregate offering price and the amount of the registration fee are
based on the average of the highest and lowest asked prices of Common Stock of
MICROS Systems, Inc. reported on the National Association of Securities Dealers
Automated Quotation System on January 26, 2000.

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


<PAGE>   2

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Not required to be included in the Form S-8 pursuant to the Note to Part I of
Form S-8.

                                     PART II

             INFORMATION NOT REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.           INCORPORATION OF DOCUMENTS BY REFERENCE.

                  The following documents which have been filed by the
Registrant with the Securities and Exchange Commission (the "Commission") are
incorporated herein by reference:

                  (a)                       Annual Report on Form 10-K for the
                                            year ended June 30, 1999.

                  (b)                       Quarterly Report on Form 10-Q for
                                            the quarter ended September 30,
                                            1999.

                  (c)                       Description of Common Stock of the
                                            Registrant contained in the
                                            Registrant's Registration Statement
                                            on Form S-3 dated January 25, 1995
                                            and any amendments or reports for
                                            purposes of updating such
                                            description.

                  (d)                       MICROS Systems, Inc. 1991 Stock
                                            Option Plan, as amended, is
                                            contained in Exhibit A to the Proxy
                                            Statement of the Company for the
                                            1999 Annual Meeting of Shareholders,
                                            which was filed on October 22, 1999.

                  All documents subsequently filed by the Registrant with the
Commission pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities
Exchange Act of 1934 ("Exchange Act"), prior to the filing of a post-effective
amendment which indicates that all securities offered have been sold or which
deregisters all securities remaining unsold, shall be deemed to be incorporated
by reference into this Registration Statement and to be a part of the
Registration Statement from the date of filing of such document.


<PAGE>   3



ITEM 4.           DESCRIPTION OF SECURITIES.

                  Not applicable.


ITEM 5.           INTERESTS OF NAMED EXPERTS AND COUNSEL.

                  Thomas L. Patz is the duly elected and acting Executive Vice
President, Strategic Initiatives and General Counsel of the Registrant, and has
acted as counsel to the Registrant in connection with the preparation and filing
with the Securities and Exchange Commission of this Registration Statement on
Form S-8. Mr. Patz beneficially owns less than 1% of the Common Stock of the
Registrant.

ITEM 6.           INDEMNIFICATION OF DIRECTORS AND OFFICERS.

                  The Registrant's Articles of Incorporation, as amended,
provide that the Registrant shall indemnify its directors and officers whether
serving the Registrant or, at the Registrant's request, another entity, to the
fullest extent required or permitted by the general laws of the State of
Maryland now or hereafter in force, including the advance of expenses under the
procedures provided by such laws. The Registrant's Articles of Incorporation
also provide that the Registrant shall indemnify its other agents or employees,
whether serving the Registrant, or at its request, another entity, to such
extent as is authorized by the Board of Directors or the By-laws of the
Registrant and as permitted by law.

                  The Maryland General Corporation Law provides that a
corporation may indemnify any director made a party to a proceeding by reason of
service in that capacity unless it is established that: (1) the act or omission
of the director was material to the matter giving rise to the proceeding and (a)
was committed in bad faith or (b) was the result of active and deliberate
dishonesty, or (2) the director actually received an improper personal benefit
in money, property or services, or (3) in the case of any criminal proceeding,
the director had reasonable cause to believe that the act or omission was
unlawful. To the extent that a director has been successful in defense of any
proceeding, the Maryland General Corporation Law provides that he or she shall
be indemnified against reasonable expenses incurred in connection therewith. A
Maryland corporation may indemnify its officers to the same extent as its
directors and to such further extent as is consistent with law.

ITEM 7.           EXEMPTION FROM REGISTRATION CLAIMED.

                  Not applicable.


<PAGE>   4

ITEM 8.EXHIBITS.

<TABLE>
<CAPTION>
Exhibit
Number            Description
------            -----------
<S>               <C>
 5                Opinion of Counsel Regarding the Legality of the shares of Common Stock

 23.1             Consent of Independent Accountants

 23.2             Consent of Counsel (included in Exhibit 5)

 24               Power of Attorney (contained in Signature page)
</TABLE>


ITEM 9.           UNDERTAKINGS.

                  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 Securities Act of 1933 (the "Securities Act");

                           (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;

                           (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.

                  Paragraphs (1)(i) and (1)(ii) do not apply if the information
required to be included in a post-effective amendment by those paragraphs is
contained in periodic reports filed by the Registrant pursuant to section 13 or
section 15(d) of the Exchange Act that are incorporated by reference in the
Registration Statement.

                  (2) That, for the purpose of determining any liability under
the Securities Act, 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.


<PAGE>   5


                  The undersigned Registrant hereby undertakes that, for
purposes of determining any liability under the Securities Act, each filing of
the Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to section 15(d) of the Exchange Act) 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.

                  Insofar as indemnification for liabilities arising under the
Securities Act 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 the Commission such
indemnification is against public policy as expressed in the Securities Act 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.

                                   SIGNATURES

                  Pursuant to the requirements of the Securities Act, the
Registrant 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 City of Beltsville, County of Prince Georges, Maryland on
this 28th day of January, 2000.

                                   MICROS SYSTEMS, INC.


                                   By: /s/ A. L. Giannopoulos
                                       ---------------------------
                                        A. L. Giannopoulos
                                        President and Chief Executive Officer


                                POWER OF ATTORNEY

         The undersigned Officers and Directors of MICROS Systems, Inc., a
Maryland corporation (the "Corporation"), hereby constitute and appoint A. L.
Giannopoulos, the true and lawful agent and attorney-in-fact of the undersigned
with full power and authority in said agent and attorney-in-fact, to sign for
the undersigned and in their respective names as Officers and as Directors of
the Corporation, a Registration Statement on Form S-8 relating to the proposed
issuance of shares of Common Stock to employees and directors of the Corporation
(or any and all amendments, including post-effective amendments, to such
Registration Statement) and file the same, with all exhibits thereto and other
documents in connection therewith, with the Securities and Exchange Commission,
and with full power of substitution; hereby ratifying and confirming all that
said attorney-in-fact, or his substitute or substitutes, may do or cause to be
done by virtue hereof.



<PAGE>   6

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on the 28th day of January, 2000.


SIGNATURE                                        TITLE


/s/A. L. Giannopoulos           President, Chief Executive Officer
---------------------           and Director (Principal Executive Officer)
A. L. Giannopoulos


SIGNATURE                                        TITLE


/s/Gary C. Kaufman              Executive Vice President, Finance and
------------------              Administration, Chief Financial Officer
Gary C. Kaufman                 (Principal Financial and Accounting Officer)


/s/Louis M. Brown, Jr.          Chairman and Director
----------------------
Louis M. Brown, Jr.


/s/Daniel A. Cohen              Director
------------------
Daniel A. Cohen


/s/F. Suzanne Jenniches         Director
-----------------------
F. Suzanne Jenniches


/s/John G. Puente               Director
-----------------
John G. Puente


/s/Dwight S. Taylor             Director
-------------------
Dwight S. Taylor


/s/A. L. Giannopoulos           As Attorney-in-Fact
---------------------
A. L. Giannopoulos


<PAGE>   7

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>
Exhibit
Number         Description
------         -----------
               Page
               ----
<S>            <C>
 5             Opinion of Counsel Regarding the Legality
               of the shares of Common Stock

 23.1          Consent of Independent Accountants

 23.2          Consent of Counsel (contained in Exhibit 5)

 24            Power of Attorney (contained in Signature
               page)
</TABLE>
[{"type": "S-8", "sequence": "1", "description": "FORM S-8", "secsgml_size_bytes": 16261}]
{"company-data": {"conformed-name": "MICROS SYSTEMS INC", "cik": "0000320345", "assigned-sic": "3578", "irs-number": "521101488", "state-of-incorporation": "MD", "fiscal-year-end": "0630"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-95615", "film-number": "516297"}, "business-address": {"street1": "12000 BALTIMORE AVE", "city": "BELTSVILLE", "state": "MD", "zip": "20705", "phone": "3012016000"}, "mail-address": {"street1": "12000 BALTIMORE AVE", "city": "BELTSVILLE", "state": "MD", "zip": "20705-1291"}}
1
                         This Exhibit Index is on page 7
    As filed with the Securities and Exchange Commission on January 28, 2000
                       Registration No. 333-_____________

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                              MICROS SYSTEMS, INC.
               (Exact name of issuer as specified in its charter)
MARYLAND                                                     52-1101488
                          --------                                                     ----------
(State or other jurisdiction of                             (I.R.S. Employer Identification No.)
              incorporation or organization)

            12000 Baltimore Avenue                                                     20705-1291
            Beltsville, Maryland                                                       (Zip Code)
            (Address of principal executive offices)
MICROS SYSTEMS, INC. 1991 STOCK OPTION PLAN
                   -------------------------------------------
                      (Effective as of September 23, 1991)
                              (Full title of plan)
(Name, address and telephone                                            (Copies to:)
number of agent for service)
ANTHONY J. RICKERT, ESQUIRE
A. L. GIANNOPOULOS                                                      JANE TAM, ESQUIRE
12000 BALTIMORE AVENUE                                                  PIPER MARBURY RUDNICK & WOLFE L.L.P.
BELTSVILLE, MARYLAND  20705-1291                                        1200 19TH STREET
(301) 210-6000                                                          WASHINGTON, D.C.  20036
CALCULATION OF REGISTRATION FEE
-----------------------------------------------------------------------------------------------------------
                                            Proposed maximum          Proposed maximum         Amount of
Title of securities      Amount to be       offering price            aggregate offering       registration
 to be registered        registered         per share                 price                    fee
-----------------------------------------------------------------------------------------------------------
Common Stock (par        1,000,000          $61.46875*                $61,468,750*             $16,227.75*
value $0.25 per share)
================================================================================
* Calculated solely for purposes of calculating the registration fee pursuant to
Rule 457 (h) and (c), the proposed maximum offering price per share, proposed
maximum aggregate offering price and the amount of the registration fee are
based on the average of the highest and lowest asked prices of Common Stock of
MICROS Systems, Inc. reported on the National Association of Securities Dealers
Automated Quotation System on January 26, 2000.

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

                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

Not required to be included in the Form S-8 pursuant to the Note to Part I of
Form S-8.

                                     PART II

             INFORMATION NOT REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.           INCORPORATION OF DOCUMENTS BY REFERENCE.

                  The following documents which have been filed by the
Registrant with the Securities and Exchange Commission (the "Commission") are
incorporated herein by reference:

                  (a)                       Annual Report on Form 10-K for the
                                            year ended June 30, 1999.

                  (b)                       Quarterly Report on Form 10-Q for
                                            the quarter ended September 30,
                                            1999.

                  (c)                       Description of Common Stock of the
                                            Registrant contained in the
                                            Registrant's Registration Statement
                                            on Form S-3 dated January 25, 1995
                                            and any amendments or reports for
                                            purposes of updating such
                                            description.

                  (d)                       MICROS Systems, Inc. 1991 Stock
                                            Option Plan, as amended, is
                                            contained in Exhibit A to the Proxy
                                            Statement of the Company for the
                                            1999 Annual Meeting of Shareholders,
                                            which was filed on October 22, 1999.

                  All documents subsequently filed by the Registrant with the
Commission pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities
Exchange Act of 1934 ("Exchange Act"), prior to the filing of a post-effective
amendment which indicates that all securities offered have been sold or which
deregisters all securities remaining unsold, shall be deemed to be incorporated
by reference into this Registration Statement and to be a part of the
Registration Statement from the date of filing of such document.
3

ITEM 4.           DESCRIPTION OF SECURITIES.

                  Not applicable.

ITEM 5.           INTERESTS OF NAMED EXPERTS AND COUNSEL.

                  Thomas L. Patz is the duly elected and acting Executive Vice
President, Strategic Initiatives and General Counsel of the Registrant, and has
acted as counsel to the Registrant in connection with the preparation and filing
with the Securities and Exchange Commission of this Registration Statement on
Form S-8. Mr. Patz beneficially owns less than 1% of the Common Stock of the
Registrant.

ITEM 6.           INDEMNIFICATION OF DIRECTORS AND OFFICERS.

                  The Registrant's Articles of Incorporation, as amended,
provide that the Registrant shall indemnify its directors and officers whether
serving the Registrant or, at the Registrant's request, another entity, to the
fullest extent required or permitted by the general laws of the State of
Maryland now or hereafter in force, including the advance of expenses under the
procedures provided by such laws. The Registrant's Articles of Incorporation
also provide that the Registrant shall indemnify its other agents or employees,
whether serving the Registrant, or at its request, another entity, to such
extent as is authorized by the Board of Directors or the By-laws of the
Registrant and as permitted by law.

                  The Maryland General Corporation Law provides that a
corporation may indemnify any director made a party to a proceeding by reason of
service in that capacity unless it is established that: (1) the act or omission
of the director was material to the matter giving rise to the proceeding and (a)
was committed in bad faith or (b) was the result of active and deliberate
dishonesty, or (2) the director actually received an improper personal benefit
in money, property or services, or (3) in the case of any criminal proceeding,
the director had reasonable cause to believe that the act or omission was
unlawful. To the extent that a director has been successful in defense of any
proceeding, the Maryland General Corporation Law provides that he or she shall
be indemnified against reasonable expenses incurred in connection therewith. A
Maryland corporation may indemnify its officers to the same extent as its
directors and to such further extent as is consistent with law.

ITEM 7.           EXEMPTION FROM REGISTRATION CLAIMED.

                  Not applicable.
4

ITEM 8.EXHIBITS.
Exhibit
Number            Description
------            -----------
5                Opinion of Counsel Regarding the Legality of the shares of Common Stock

 23.1             Consent of Independent Accountants

 23.2             Consent of Counsel (included in Exhibit 5)

 24               Power of Attorney (contained in Signature page)
ITEM 9.           UNDERTAKINGS.

                  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 Securities Act of 1933 (the "Securities Act");

                           (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;

                           (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.

                  Paragraphs (1)(i) and (1)(ii) do not apply if the information
required to be included in a post-effective amendment by those paragraphs is
contained in periodic reports filed by the Registrant pursuant to section 13 or
section 15(d) of the Exchange Act that are incorporated by reference in the
Registration Statement.

                  (2) That, for the purpose of determining any liability under
the Securities Act, 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.
5

                  The undersigned Registrant hereby undertakes that, for
purposes of determining any liability under the Securities Act, each filing of
the Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to section 15(d) of the Exchange Act) 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.

                  Insofar as indemnification for liabilities arising under the
Securities Act 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 the Commission such
indemnification is against public policy as expressed in the Securities Act 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.

                                   SIGNATURES

                  Pursuant to the requirements of the Securities Act, the
Registrant 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 City of Beltsville, County of Prince Georges, Maryland on
this 28th day of January, 2000.

                                   MICROS SYSTEMS, INC.

                                   By: /s/ A. L. Giannopoulos
                                       ---------------------------
                                        A. L. Giannopoulos
                                        President and Chief Executive Officer

                                POWER OF ATTORNEY

         The undersigned Officers and Directors of MICROS Systems, Inc., a
Maryland corporation (the "Corporation"), hereby constitute and appoint A. L.
Giannopoulos, the true and lawful agent and attorney-in-fact of the undersigned
with full power and authority in said agent and attorney-in-fact, to sign for
the undersigned and in their respective names as Officers and as Directors of
the Corporation, a Registration Statement on Form S-8 relating to the proposed
issuance of shares of Common Stock to employees and directors of the Corporation
(or any and all amendments, including post-effective amendments, to such
Registration Statement) and file the same, with all exhibits thereto and other
documents in connection therewith, with the Securities and Exchange Commission,
and with full power of substitution; hereby ratifying and confirming all that
said attorney-in-fact, or his substitute or substitutes, may do or cause to be
done by virtue hereof.
6

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on the 28th day of January, 2000.

SIGNATURE                                        TITLE

/s/A. L. Giannopoulos           President, Chief Executive Officer
---------------------           and Director (Principal Executive Officer)
A. L. Giannopoulos

SIGNATURE                                        TITLE

/s/Gary C. Kaufman              Executive Vice President, Finance and
------------------              Administration, Chief Financial Officer
Gary C. Kaufman                 (Principal Financial and Accounting Officer)

/s/Louis M. Brown, Jr.          Chairman and Director
----------------------
Louis M. Brown, Jr.

/s/Daniel A. Cohen              Director
------------------
Daniel A. Cohen

/s/F. Suzanne Jenniches         Director
-----------------------
F. Suzanne Jenniches

/s/John G. Puente               Director
-----------------
John G. Puente

/s/Dwight S. Taylor             Director
-------------------
Dwight S. Taylor

/s/A. L. Giannopoulos           As Attorney-in-Fact
---------------------
A. L. Giannopoulos
7

                                  EXHIBIT INDEX
Exhibit
Number         Description
------         -----------
               Page
               ----
5             Opinion of Counsel Regarding the Legality
               of the shares of Common Stock

 23.1          Consent of Independent Accountants

 23.2          Consent of Counsel (contained in Exhibit 5)

 24            Power of Attorney (contained in Signature
               page)