UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16

under the Securities Exchange Act of

1934

For the month of November2023Commission File Number:001-15014

SUN LIFE FINANCIAL INC.

(the “Company”)

(Translation of registrant’s name into English)

1 York Street, 31st Floor, Toronto, Ontario M5J 0B6

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F            Form 40-F    X

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ____

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ____

Exhibit

99.1    Press Release dated November 13, 2023 – Sun Life Reports September 30, 2023 Results

SIGNATURE

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

Sun Life Financial Inc.

                        (Registrant)

Date: November 13, 2023                By    /s/ “Tracie Allan”            

                            Tracie Allan

    Assistant Vice-President & Managing Counsel

Exhibit 99.1