<PAGE>   1

        As filed with the Securities and Exchange Commission on__________, 1998

                                                  Registration No. 333-_______ 
-------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C.
                       -----------------------------------

                                    FORM S-8

                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                       -----------------------------------

                          SIGMATRON INTERNATIONAL, INC.
             (Exact name of registrant as specified in its charter)

                   Delaware                                   36-3918470
        (State or other jurisdiction of                    (I.R.S. Employer
         incorporation or organization)                   Identification No.)

     2201 Landmeier Road, Elk Grove Village,                    IL 60007
    (Address of Principal Executive Offices)                   (Zip Code)


                       1997 DIRECTORS' STOCK OPTION PLAN
                           (Full title of the plans)
                                        
                              Mr. Gary R. Fairhead
                         Sigmatron International, Inc.
                               2201 Landmeier Rd.
                          Elk Grove Village, IL 60007
                    (Name and address of agent for service)
                                        
                                 (847)956-8000
         (Telephone number, including area code, of agent for service)

<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
--------------------------------------------------------------------------------------------
                                           Proposed         Proposed
     Title of             Amount           maximum          maximum          Amount of
     securities to        to be            offering price   aggregate        registration
     be registered        registered       per share        offering price   fee
--------------------------------------------------------------------------------------------
<S>                    <C>                 <C>              <C>              <C>
     Common Stock,
     $.01 par value    35,000 shares (a)   $14.50           $507,500.00(b)   $149.71(d)

     Common Stock,
     $.01 par value    70,000 shares (a)   $ 4.625          $523,750.00(c)   $ 95.51(d)


     Total Registration Fee:                                                 $245.22
--------------------------------------------------------------------------------------------
</TABLE>

(a)  Represents the maximum number of shares which could be purchased upon 
     exercise of all options granted under the 1997 Directors Stock Option Plan.

(b)  Represents the aggregate offering price for the options granted on 
     September 19, 1997.

(c)  Estimated solely for purposes of calculating the registration fee and
     based on the average high and low prices of the Company's Common stock
     on September 10, 1998, as reported in the Nasdaq National Market System.

(d)  Registration Fee computed pursuant to Rule 457 (h)(1)


<PAGE>   2



                                    PART II
                                        
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

     The documents listed in (a) through (c) below are incorporated by reference
in this Registration Statement, and all documents subsequently filed by the
Company pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities
Exchange Act of 1934, prior to the filing of a post-effective amendment which
indicates that all securities offered 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 part thereof from the date of
filing of such documents:

     (a) The Company's annual report on Form 10-K for the year ended April 30,
         1998.

     (b) The Company's quarterly report on Form 10-Q for the quarter ended July
         31, 1998.

     (c) The description of the Company's Common Stock is contained in the
         Registration Statement on Form 8-A declared effective on January 21,
         1994, File No. 0-23248, including any amendment or report filed for the
         purpose of updating such description.


ITEM 4.  DESCRIPTION OF SECURITIES.

     Not Applicable.


ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

     The validity of the shares of Common Stock offered hereby will be passed
upon by D'Ancona & Pflaum, Chicago, Illinois. Mr. Arthur Don, an Assistant
Secretary of the registrant and a partner of D'Ancona & Pflaum, beneficially
owns 400 shares of the registrant's Common Stock. Other partners at D'Ancona &
Pflaum beneficially own additional shares of the registrant's Common Stock,
which ownership is not material.


ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Section 145 of the Delaware General Corporate Law authorizes a corporation
to indemnify its directors and officers (including reimbursement for expenses
incurred). The Company's Bylaws provide for indemnification to the fullest
extent permitted by the provisions of the Delaware statute.

     The Company maintains a directors' and officers' liability insurance policy
that, subject to terms and conditions of the policy, insures the directors and
officers of the registrant against losses up to $3,000,000 in the aggregate
arising from any wrongful acts (as defined by the policy) in his or her capacity
as a director or officer. The policy reimburses the Company for amounts which
the Company lawfully indemnifies or is required or permitted by law to indemnify
its directors and officers in excess of $100,000.


ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

     Not Applicable.

ITEM 8.  CONSULTANTS AND ADVISORS 
     Not Applicable

ITEM 9.  EXHIBITS.

     4.1 Certificate of Incorporation, filed as Exhibit 3.1 to Company's
         Registration Statement on Form S-1, dated February 9, 1994, File No.
         33-72100, and hereby incorporated by reference.



                                       2

<PAGE>   3


     4.2  Bylaws of the Company, filed as Exhibit 3.2 to Company's Registration 
          Statement on Form S-1, dated February 9, 1994, File No. 33-72100, and
          hereby incorporated by reference.

     4.3  The 1997 Directors' Stock Option Plan, as amended May 1998.

     5.1  Opinion of D'Ancona & Pflaum.

     23.1 Consent of Ernst & Young.

     23.2 Consent of D'Ancona & Pflaum (included in Exhibit 5.1).

     24.1 Powers of Attorney (included herein).

ITEM 10.  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 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;

         (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;

         Provided, however, that paragraphs (1)(i) and 1(ii) do not apply if the
     registration statement is on Form S-3, Form S-8 or Form F-3 and 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 Securities Exchange Act of
     1934 that are incorporated by reference 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.

     The undersigned Company hereby undertakes that, for the purposes of
determining any liability under the Securities Act of 1933, each filing of the
Company's annual report pursuant to section 13(a) or 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.

     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 Company has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the Company 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 Company will, unless in the opinion of its counsel the 



                                       3
<PAGE>   4



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 of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all the
requirements for filing 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 Elk Grove Village, State of Illinois, on the 28th day of May, 1998.


                                    SIGMATRON INTERNATIONAL, INC.
                                    (Company)


                                    By: /s/ Gary R. Fairhead  
                                        --------------------------------
                                         Gary R. Fairhead, President and
                                         Chief Executive Officer


     KNOW ALL MEN BY THESE PRESENTS, that the undersigned directors and officers
of SigmaTron International, Inc., a Delaware corporation, which is filing a
Registration Statement on Form S-8 with the Securities and Exchange Commission,
under the provisions of the Securities Act of 1933, as amended, hereby
constitute and appoint Gary R. Fairhead their true and lawful attorney-in-fact
and agent, with full power and substitution and re-substitution, for him or her
and in his or her name, place and stead, in any and all capacities, to sign such
Registration Statement and any or all pre-effective and post-effective
amendments to the Registration Statement, and all other documents in connection
therewith to be filed with the Securities and Exchange Commission, granting unto
said attorney-in-fact and agent full power and authority to do and perform each
and every act and thing requisite and necessary to be done in and about the
premises, as fully to all interests and purposes as each of them might or could
do in person, hereby ratifying and confirming all that said attorney-in-fact and
agent or his substitutes, may lawfully do or cause to be done by virtue hereof.

     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                          Date
      ---------                     -----                          ----

/s/ Franklin D. Sove                Chairman of the Board          May 28, 1998
--------------------------          and Director
(Franklin D. Sove)                 


/s/ Gary R. Fairhead                President, Chief               May 28, 1998
--------------------------          Executive Officer
(Gary R. Fairhead)                  and Director 
                                     


/s/ Linda K. Blake                  Chief Financial Officer,       May 28, 1998
--------------------------          Treasurer and Secretary
(Linda K. Blake)                    (Principal Financial Officer        
                                    and Principal Accounting
                                    Officer)
                                    


/s/ John P. Chen                    Director                       May 28, 1998
--------------------------
(John P. Chen)




                                       4


 



<PAGE>   5

/s/ William C. Mitchell             Director                       May 28, 1998
--------------------------
(William C. Mitchell)


/s/ D. S. Patel                     Director                       May 28, 1998
--------------------------
(D. S. Patel)


/s/ Thomas W.   Rieck               Director                       May 28, 1998
--------------------------
(Thomas W. Rieck)


/s/ Dilip S. Vyas                   Director                       May 28, 1998
--------------------------
(Dilip S. Vyas)


/s/ Steven A. Rothstein             Director                       May 28, 1998
--------------------------
(Steven A. Rothstein)




                                       5
[{"type": "S-8", "sequence": "1", "description": "FORM S-8", "secsgml_size_bytes": 14557}]
{"company-data": {"conformed-name": "SIGMATRON INTERNATIONAL INC", "cik": "0000915358", "assigned-sic": "3672", "irs-number": "363918470", "state-of-incorporation": "DE", "fiscal-year-end": "0430"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-63389", "film-number": "98709514"}, "business-address": {"street1": "2201 LANDMEIER RD", "city": "ELK GROVE VILLAGE", "state": "IL", "zip": "60007", "phone": "7089568000"}, "mail-address": {"street1": "2201 LANDMEIER ROAD", "city": "ELK GROVE VILLAGE", "state": "IL", "zip": "60007"}}
1

        As filed with the Securities and Exchange Commission on__________, 1998

                                                  Registration No. 333-_______ 
-------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C.
                       -----------------------------------

                                    FORM S-8

                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                       -----------------------------------

                          SIGMATRON INTERNATIONAL, INC.
             (Exact name of registrant as specified in its charter)

                   Delaware                                   36-3918470
        (State or other jurisdiction of                    (I.R.S. Employer
         incorporation or organization)                   Identification No.)

     2201 Landmeier Road, Elk Grove Village,                    IL 60007
    (Address of Principal Executive Offices)                   (Zip Code)

                       1997 DIRECTORS' STOCK OPTION PLAN
                           (Full title of the plans)
                                        
                              Mr. Gary R. Fairhead
                         Sigmatron International, Inc.
                               2201 Landmeier Rd.
                          Elk Grove Village, IL 60007
                    (Name and address of agent for service)
                                        
                                 (847)956-8000
         (Telephone number, including area code, of agent for service)
CALCULATION OF REGISTRATION FEE
--------------------------------------------------------------------------------------------
                                           Proposed         Proposed
     Title of             Amount           maximum          maximum          Amount of
     securities to        to be            offering price   aggregate        registration
     be registered        registered       per share        offering price   fee
--------------------------------------------------------------------------------------------
Common Stock,
     $.01 par value    35,000 shares (a)   $14.50           $507,500.00(b)   $149.71(d)

     Common Stock,
     $.01 par value    70,000 shares (a)   $ 4.625          $523,750.00(c)   $ 95.51(d)

     Total Registration Fee:                                                 $245.22
--------------------------------------------------------------------------------------------
(a)  Represents the maximum number of shares which could be purchased upon 
     exercise of all options granted under the 1997 Directors Stock Option Plan.

(b)  Represents the aggregate offering price for the options granted on 
     September 19, 1997.

(c)  Estimated solely for purposes of calculating the registration fee and
     based on the average high and low prices of the Company's Common stock
     on September 10, 1998, as reported in the Nasdaq National Market System.

(d)  Registration Fee computed pursuant to Rule 457 (h)(1)
2

                                    PART II
                                        
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

     The documents listed in (a) through (c) below are incorporated by reference
in this Registration Statement, and all documents subsequently filed by the
Company pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities
Exchange Act of 1934, prior to the filing of a post-effective amendment which
indicates that all securities offered 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 part thereof from the date of
filing of such documents:

     (a) The Company's annual report on Form 10-K for the year ended April 30,
         1998.

     (b) The Company's quarterly report on Form 10-Q for the quarter ended July
         31, 1998.

     (c) The description of the Company's Common Stock is contained in the
         Registration Statement on Form 8-A declared effective on January 21,
         1994, File No. 0-23248, including any amendment or report filed for the
         purpose of updating such description.

ITEM 4.  DESCRIPTION OF SECURITIES.

     Not Applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

     The validity of the shares of Common Stock offered hereby will be passed
upon by D'Ancona & Pflaum, Chicago, Illinois. Mr. Arthur Don, an Assistant
Secretary of the registrant and a partner of D'Ancona & Pflaum, beneficially
owns 400 shares of the registrant's Common Stock. Other partners at D'Ancona &
Pflaum beneficially own additional shares of the registrant's Common Stock,
which ownership is not material.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Section 145 of the Delaware General Corporate Law authorizes a corporation
to indemnify its directors and officers (including reimbursement for expenses
incurred). The Company's Bylaws provide for indemnification to the fullest
extent permitted by the provisions of the Delaware statute.

     The Company maintains a directors' and officers' liability insurance policy
that, subject to terms and conditions of the policy, insures the directors and
officers of the registrant against losses up to $3,000,000 in the aggregate
arising from any wrongful acts (as defined by the policy) in his or her capacity
as a director or officer. The policy reimburses the Company for amounts which
the Company lawfully indemnifies or is required or permitted by law to indemnify
its directors and officers in excess of $100,000.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

     Not Applicable.

ITEM 8.  CONSULTANTS AND ADVISORS 
     Not Applicable

ITEM 9.  EXHIBITS.

     4.1 Certificate of Incorporation, filed as Exhibit 3.1 to Company's
         Registration Statement on Form S-1, dated February 9, 1994, File No.
         33-72100, and hereby incorporated by reference.

                                       2
3

     4.2  Bylaws of the Company, filed as Exhibit 3.2 to Company's Registration 
          Statement on Form S-1, dated February 9, 1994, File No. 33-72100, and
          hereby incorporated by reference.

     4.3  The 1997 Directors' Stock Option Plan, as amended May 1998.

     5.1  Opinion of D'Ancona & Pflaum.

     23.1 Consent of Ernst & Young.

     23.2 Consent of D'Ancona & Pflaum (included in Exhibit 5.1).

     24.1 Powers of Attorney (included herein).

ITEM 10.  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 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;

         (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;

         Provided, however, that paragraphs (1)(i) and 1(ii) do not apply if the
     registration statement is on Form S-3, Form S-8 or Form F-3 and 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 Securities Exchange Act of
     1934 that are incorporated by reference 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.

     The undersigned Company hereby undertakes that, for the purposes of
determining any liability under the Securities Act of 1933, each filing of the
Company's annual report pursuant to section 13(a) or 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.

     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 Company has
been advised that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the Company 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 Company will, unless in the opinion of its counsel the 

                                       3
4

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 of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all the
requirements for filing 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 Elk Grove Village, State of Illinois, on the 28th day of May, 1998.

                                    SIGMATRON INTERNATIONAL, INC.
                                    (Company)

                                    By: /s/ Gary R. Fairhead  
                                        --------------------------------
                                         Gary R. Fairhead, President and
                                         Chief Executive Officer

     KNOW ALL MEN BY THESE PRESENTS, that the undersigned directors and officers
of SigmaTron International, Inc., a Delaware corporation, which is filing a
Registration Statement on Form S-8 with the Securities and Exchange Commission,
under the provisions of the Securities Act of 1933, as amended, hereby
constitute and appoint Gary R. Fairhead their true and lawful attorney-in-fact
and agent, with full power and substitution and re-substitution, for him or her
and in his or her name, place and stead, in any and all capacities, to sign such
Registration Statement and any or all pre-effective and post-effective
amendments to the Registration Statement, and all other documents in connection
therewith to be filed with the Securities and Exchange Commission, granting unto
said attorney-in-fact and agent full power and authority to do and perform each
and every act and thing requisite and necessary to be done in and about the
premises, as fully to all interests and purposes as each of them might or could
do in person, hereby ratifying and confirming all that said attorney-in-fact and
agent or his substitutes, may lawfully do or cause to be done by virtue hereof.

     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                          Date
      ---------                     -----                          ----

/s/ Franklin D. Sove                Chairman of the Board          May 28, 1998
--------------------------          and Director
(Franklin D. Sove)                 

/s/ Gary R. Fairhead                President, Chief               May 28, 1998
--------------------------          Executive Officer
(Gary R. Fairhead)                  and Director 
                                     

/s/ Linda K. Blake                  Chief Financial Officer,       May 28, 1998
--------------------------          Treasurer and Secretary
(Linda K. Blake)                    (Principal Financial Officer        
                                    and Principal Accounting
                                    Officer)
                                    

/s/ John P. Chen                    Director                       May 28, 1998
--------------------------
(John P. Chen)

                                       4
5

/s/ William C. Mitchell             Director                       May 28, 1998
--------------------------
(William C. Mitchell)

/s/ D. S. Patel                     Director                       May 28, 1998
--------------------------
(D. S. Patel)

/s/ Thomas W.   Rieck               Director                       May 28, 1998
--------------------------
(Thomas W. Rieck)

/s/ Dilip S. Vyas                   Director                       May 28, 1998
--------------------------
(Dilip S. Vyas)

/s/ Steven A. Rothstein             Director                       May 28, 1998
--------------------------
(Steven A. Rothstein)

                                       5