<PAGE>
                     U.S. SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    --------

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                         Date of Report: August 13, 2002
                        (Date of earliest event reported)


                           NORTEL NETWORKS CORPORATION
             (Exact name of registrant as specified in its charter)


          CANADA                    001-07260                 NOT APPLICABLE
(State or other jurisdiction       (Commission                (IRS employer
     of incorporation)             file number)              identification no.)

                           8200 Dixie Road, Suite 100
                       Brampton, Ontario, Canada, L6T 5P6
                                 (905) 863-0000

 (Address and telephone number of the registrant's principal executive offices)






<PAGE>


                           NORTEL NETWORKS CORPORATION
                           CURRENT REPORT ON FORM 8-K

Item 7.  Exhibits.


Exhibit Number      Description of Document
--------------      -----------------------

99                  Certification pursuant to Section 906 of the Sarbanes-Oxley
                    Act of 2002 (subsections (a) and (b) of Section 1350,
                    Chapter 63 of Title 18, United States Code), filed solely
                    for purposes of incorporation by reference into Item 9
                    herein. See paragraph 2 of Item 9 below.


Item 9.  Regulation FD Disclosure.

On August 13, 2002, Nortel Networks Corporation filed with the Securities and
Exchange Commission its Quarterly Report on Form 10-Q for the quarter ended June
30, 2002 accompanied by the certification of Frank A. Dunn, President and Chief
Executive Officer, and Douglas C. Beatty, Chief Financial Officer, required
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and
(b) of Section 1350, Chapter 63 of Title 18, United States Code). A conformed
copy of this certification is attached hereto as Exhibit 99 and is incorporated
herein solely for purposes of this Item 9.

The information in this Current Report on Form 8-K, including the exhibit, is
furnished pursuant to Item 9 of Form 8-K and shall not be deemed "filed" for the
purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise
subject to liability under that Section. In addition, the information in this
Current Report on Form 8-K, including the exhibit, shall not be deemed to be
incorporated by reference into the filings of Nortel Networks Corporation under
the Securities Act of 1933.






<PAGE>


                                   SIGNATURES


     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                        Nortel Networks Corporation


                                        By: /s/ DEBORAH J. NOBLE
                                            ------------------------

                                            Deborah J. Noble
                                            Corporate Secretary



                                        By: /s/ BLAIR F. MORRISON
                                            ------------------------

                                            Blair F. Morrison
                                            Assistant Secretary



Date:  August 13, 2002




<PAGE>



                                INDEX TO EXHIBITS


Exhibit Number      Description of Document
--------------      -----------------------

99                  Certification pursuant to Section 906 of the Sarbanes-Oxley
                    Act of 2002 (subsections (a) and (b) of Section 1350,
                    Chapter 63 of Title 18, United States Code), filed solely
                    for purposes of incorporation by reference into Item 9 of
                    this Current Report on Form 8-K. See paragraph 2 of Item 9.
[{"type": "8-K", "sequence": "1", "filename": "t07702e8vk.txt", "description": "FORM 8-K", "secsgml_size_bytes": 4251}]
{"company-data": {"conformed-name": "NORTEL NETWORKS CORP", "cik": "0000072911", "assigned-sic": "3661", "irs-number": "621262580", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-07260", "film-number": "02729311"}, "business-address": {"street1": "8200 DIXIE ROAD SUITE 100", "street2": "BRAMPTON", "city": "ONTARIO CANADA", "state": "A6", "zip": "L6T 5P6", "phone": "9058631103"}, "mail-address": {"street1": "8200 DIXIE ROAD", "street2": "SUITE 100 BRAMPTON", "city": "ONTARIO CANADA", "state": "A6", "zip": "L6T 5P6"}, "former-company": [{"former-conformed-name": "NORTHERN ELECTRIC CO LTD", "date-changed": "19760324"}, {"former-conformed-name": "NORTHERN TELECOM LTD", "date-changed": "19940831"}]}
U.S. SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    --------

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                         Date of Report: August 13, 2002
                        (Date of earliest event reported)

                           NORTEL NETWORKS CORPORATION
             (Exact name of registrant as specified in its charter)

          CANADA                    001-07260                 NOT APPLICABLE
(State or other jurisdiction       (Commission                (IRS employer
     of incorporation)             file number)              identification no.)

                           8200 Dixie Road, Suite 100
                       Brampton, Ontario, Canada, L6T 5P6
                                 (905) 863-0000

 (Address and telephone number of the registrant's principal executive offices)
NORTEL NETWORKS CORPORATION
                           CURRENT REPORT ON FORM 8-K

Item 7.  Exhibits.

Exhibit Number      Description of Document
--------------      -----------------------

99                  Certification pursuant to Section 906 of the Sarbanes-Oxley
                    Act of 2002 (subsections (a) and (b) of Section 1350,
                    Chapter 63 of Title 18, United States Code), filed solely
                    for purposes of incorporation by reference into Item 9
                    herein. See paragraph 2 of Item 9 below.

Item 9.  Regulation FD Disclosure.

On August 13, 2002, Nortel Networks Corporation filed with the Securities and
Exchange Commission its Quarterly Report on Form 10-Q for the quarter ended June
30, 2002 accompanied by the certification of Frank A. Dunn, President and Chief
Executive Officer, and Douglas C. Beatty, Chief Financial Officer, required
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and
(b) of Section 1350, Chapter 63 of Title 18, United States Code). A conformed
copy of this certification is attached hereto as Exhibit 99 and is incorporated
herein solely for purposes of this Item 9.

The information in this Current Report on Form 8-K, including the exhibit, is
furnished pursuant to Item 9 of Form 8-K and shall not be deemed "filed" for the
purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise
subject to liability under that Section. In addition, the information in this
Current Report on Form 8-K, including the exhibit, shall not be deemed to be
incorporated by reference into the filings of Nortel Networks Corporation under
the Securities Act of 1933.
SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                        Nortel Networks Corporation

                                        By: /s/ DEBORAH J. NOBLE
                                            ------------------------

                                            Deborah J. Noble
                                            Corporate Secretary

                                        By: /s/ BLAIR F. MORRISON
                                            ------------------------

                                            Blair F. Morrison
                                            Assistant Secretary

Date:  August 13, 2002
INDEX TO EXHIBITS

Exhibit Number      Description of Document
--------------      -----------------------

99                  Certification pursuant to Section 906 of the Sarbanes-Oxley
                    Act of 2002 (subsections (a) and (b) of Section 1350,
                    Chapter 63 of Title 18, United States Code), filed solely
                    for purposes of incorporation by reference into Item 9 of
                    this Current Report on Form 8-K. See paragraph 2 of Item 9.