<DOCUMENT>
<TYPE>NT 10-Q
<SEQUENCE>1
<FILENAME>y91842nt10vq.txt
<DESCRIPTION>NAPCO SECURITY SYSTEMS, INC.
<TEXT>
<PAGE>
                                                                   OMB APPROVAL
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                                  UNITED STATES                 SEC File Number
                       SECURITIES AND EXCHANGE COMMISSION             000-10004
                             Washington, D.C. 20549
                                                                   Cusip Number
                                 FORM 12b-25                        630402 10 5

                           NOTIFICATION OF LATE FILING

(Check One) __ Form 10-K  __ Form 20-F __ Form 11-K  _X_ Form 10-Q
__ Form N-SAR __ Form N-CSR

                      For Period Ended: September 30, 2003

                       [ ] Transition Report on Form 10-K
                       [ ] Transition Report on Form 20-F
                       [ ] Transition Report on Form 11-K
                       [ ] Transition Report on Form 10-Q
                       [ ] Transition Report on Form N-SAR
          For the Transition Period Ended:____________________________

 READ ATTACHED INSTRUCTION SHEET BEFORE PREPARING FORM.  PLEASE PRINT OR TYPE

       Nothing in the form shall be construed to imply that the Commission
                 has verified any information contained herein.
--------------------------------------------------------------------------------
      If the notification relates to a portion of the filing checked above,
             identify the Item(s) to which the notification relates:
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PART I - REGISTRANT INFORMATION

NAPCO SECURITY SYSTEMS, INC.
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Full Name of Registrant

--------------------------------------------------------------------------------
Former Name if Applicable

333 BAYVIEW AVENUE
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Address of Principal Executive Office (STREET AND NUMBER)

AMITYVILLE, NY 11701
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City, State and Zip Code
<PAGE>


PART II - RULES 12b-25(b) and (c)

If the subject report could not be filed without unreasonable effort or expense
and the registrant seeks relief pursuant to Rule 12b-25(b), the following should
be completed. (Check box if appropriate)

         (a)     The reasons described in reasonable detail in Part III of this
                 form could not be eliminated without unreasonable effort or
                 expense;

 [ ]     (b)     The subject annual report, semi-annual report, transition
                 report on Form 10-K, Form 20-F, 11-K, Form N-SAR, Form N-CSR
                 or portion thereof, will be filed on or before the fifteenth
                 calendar day following the prescribed due date; or the
                 subject quarterly report of transition report on Form 10-Q,
                 or portion thereof will be filed on or before the
                 fifth calendar day following the prescribed due date; and

         (c)     The accountant's statement or other exhibit required by Rule
                 12b-25(c) has been attached if applicable.

PART III - NARRATIVE

State below in reasonable detail the reasons why the Form 10-K, 11-K, 10-Q,
N-SAR, N-CSR or the transition report or portion thereof, could not be filed
with the prescribed time period.  (Attach Extra Sheets if Needed)

The filing of the Form 10-Q of Napco Security Systems, Inc. for the quarter
ended September 30, 2003 will be delayed due to the still unresolved,
previously reported, tax matter concerning the Company's Dominican Republic
subsidiary.  The Company expects to promptly file its Form 10-K for the fiscal
year ended June 30, 2003 and its Form 10-Q for the quarter ended September 30,
2003 as soon as this issue is resolved.

PART IV - OTHER INFORMATION

(1)      Name and telephone number of person to contact in regard to this
         notification

         Kevin S. Buchel                  (631)                 842-9400
         --------------------------     -----------        ------------------
                  (Name)                (Area Code)        (Telephone Number)

<PAGE>

(2)      Have all other periodic reports required under Section 13 or 15(d) of
         the Securities Exchange Act of 1934 or Section 30 of the Investment
         Company Act of 1940 during the preceding 12 months or for such shorter
         period that the registrant was required to file such reports been
         filed? If answer is no identify report(s).

          ___ Yes _X_ No The Annual Report on Form 10-K for the period
                         ending June 30, 2003 has not yet been filed.

(3)      Is it anticipated that any significant change in results of operations
         from the corresponding period for the last fiscal year will be
         reflected by the earnings statements to be included in the subject
         report or portion thereof? ___ Yes  _X_  No

         If so, attach an explanation of the anticipated change, both
         narratively and quantitatively, and, if appropriate, state the reasons
         why a reasonable estimate of the results cannot be made.


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

                          NAPCO SECURITY SYSTEMS, INC.
             ------------------------------------------------------
                  (Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned
hereunto duly authorized.


Date        11/14/03                  By     /s/ Kevin S. Buchel
    ---------------------------        ----------------------------------------
                                            Senior Vice President

INSTRUCTION: The form may be signed by an executive officer of the registrant or
by any other duly authorized representative. The name and title of the persons
signing the form shall be typed or printed beneath the signature. If the
statement is signed on behalf of the registrant by an authorized representative
(other than an executive officer), evidence of the representative's authority to
sign on behalf of the registrant shall be filed with the form.

                                    ATTENTION
  Intentional misstatements or omissions of fact constitute Federal Criminal
                       Violations (See 18 U.S.C. 1001).


                               GENERAL INSTRUCTION

1.       This form is required by Rule 12b-25 (17 CFR 240.12b-25) of the General
         Rules and Regulations under the Securities Exchange Act of 1934.
<PAGE>

2.       One signed original and four conformed copies of this form and
         amendments thereto must be completed and filed with the Securities and
         Exchange Commission, Washington, D.C. 20549 in accordance with Rule 0-3
         of the General Rules and Regulations under the Act. The information
         contained in or filed with the form will be made a matter of public
         record in the Commission files.

3.       A manually signed copy of the form and amendments thereto shall be
         filed with each national securities exchange on which any class of
         securities of the registrant is registered.

4.       Amendments to the notifications must also be filed on form 12b-25 but
         need not restate information that has been correctly furnished. The
         form shall be clearly identified as an amendment notification.

5.       ELECTRONIC FILERS. This form shall not be used by electronic filers
         unable to timely file a report solely due to electronic difficulties.
         Filers unable to submit a report within the time period prescribed due
         to difficulties in electronic filing should comply with either Rule 201
         or Rule 202 of Regulation S-T (Section 232.201 or Section 232.202 of
         this chapter) or apply for an adjustment in filing date pursuant to
         Rule 13(b) of Regulation S-T (Section 232.12(c) of this chapter).



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