Prospectus Certification by Investment Company (Form 497J)

JOHN HANCOCK FUNDS III
200 Berkeley Street
Boston, Massachusetts 02116

July 31, 2026

VIA EDGAR TRANSMISSION

U.S. Securities and Exchange Commission
100 F Street, NE
Washington, D.C. 20549

Ladies and Gentlemen:

On behalf of the Trust, pursuant to paragraph (j) of Rule 497 under the Securities Act of 1933, as amended (the "Securities Act"), please accept this letter as notice that the forms of Prospectuses and Statement of Additional Information for the Funds that would have been filed under paragraph (c) of Rule 497 would not have differed from the Prospectuses and Statement of Additional Information, each dated August 1, 2026, contained in Post-Effective Amendment No. 93 to the Trust's Registration Statement on Form N-1A under the Securities Act and Amendment No. 95 to its Registration Statement under the Investment Company Act of 1940, as amended, the text of which was filed electronically with the U.S. Securities and Exchange Commission on July 24, 2026 via EDGAR, accession number 0001193125-26-315460.

If you have any questions or comments, please call me at (857) 328-2178.

Sincerely, 

/s/ Khimmara Greer

Khimmara Greer Assistant Secretary of the Trust