UNITED STATES                                
                       SECURITIES AND EXCHANGE COMMISSION                      
                             Washington, D.C. 20549                            


                                   FORM 12b-25                                 


                                                 SEC FILE NUMBER: 0-10004      
                                                 CUSIP NUMBER:    630402 10 5  



                           NOTIFICATION OF LATE FILING                         






Check One): [ ] Form 10-K  [ ] Form 20-F  [ ] Form 11-K  [X] Form 10-Q         
            [ ] Form 10-D  [ ] Form N-SAR [ ] Form N-CSR                       

For the Period Ended:      September 30, 2005                                  
                      --------------------------------                         

[ ] 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:                                               
                                -------------------------                      


Nothing in this 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                       
                                                                               
Full Name of Registrant:     Napco Security Systems, Inc.                      
                             ----------------------------                      
                                                                               
Former Name if Applicable:     N/A                                             
                               ---
 
Address of Principal Executive Office (Street and Number):   333 Bayview Avenue
                                                             ------------------

City, State and Zip Code:     Amityville, New York 11701
                              --------------------------



                                                                                
                                                                                
                                                                                
                       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)                       
                                                                                
                                                                                
[X]      (a) The reasons described in reasonable detail in Part III of this form
         could not be eliminated without unreasonable effort or expense;        
[X]      (b) The subject annual report, semi-annual report, transition report on
         Form 10-K, Form 20-F,Form 11-K, Form N-SAR or 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 or  
         transition report on Form 10-Q or subject distribution report on Form  
         10-D, 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 Forms 10-K, 20-F, 11-K, 10-Q,  
10-D, N-SAR, N-CSR, or the transition report or portion thereof, could not be   
filed within the prescribed time period. (Attach Extra Sheets if Needed)        
                                                                                
The Company has been unable to file its Form 10-Q by the due date because of    
illness of a member of the Company's accounting staff which resulted in certain 
documents not being completed in time to permit the timely preparation of the   
Company's financial statements.                                                 
                                                                                
                          PART IV-- OTHER INFORMATION                           
(1) Name and telephone number of person to contact in regard to this            
notification                                                                    
                                                                                
                                                                                
                                                                                
Kevin S. Buchel            (631)                            842-9400            
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(Name)                     (Area Code)                      (Telephone Number)  
                                                                                
                                                                                
(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 report(s) been filed? If answer is no,     
identify report(s).                                                             
                                                                 [X] Yes [ ] No 
                                                                                
(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?    
                                                                                
                                                                 [X] Yes [ ] No 
                                                                                
The Company expects to report a net income of approximately $800,000 for the    
three months ended September 30, 2005, compared to a net income of approximately
$513,000 for the three months ended September 30, 2004.
                                                              
                                                                                
Napco Security Systems, Inc. has caused this notification to be signed on its   
behalf by the undersigned hereunto duly authorized.                             
                                                                                
Date: November 15, 2005                                                         
                                                                                
                                                                                
                                                   By: /s/ Kevin S. Buchel      
                                                       -------------------------
                                                       Kevin S. Buchel,         
                                                       Senior Vice President of 
                                                       Operations and Finance