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UNITED\nSTATES

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K\n

Report of Foreign Private Issuer
\nPursuant to Rule 13a-16 or 15d-16
\nunder the Securities Exchange Act of 1934

\n\n \n \n

For the month\n of October 2026

Commission File Number: 001-15014

SUN LIFE FINANCIAL INC.

(Translation of registrant's name into English)

1\nYork Street, 31st Floor, Toronto, Ontario, M5J 0B6

(Address of principal executive offices)

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

\n\n \n \n \n

Form 20-F\n ☐

Form 40-F\n ☒

\n\n \n \n \n\n \n \n \n\n \n \n \n\n \n \n \n\n\n\n\n\n \n


Exhibits		Description

99.1		News Release dated\n October 8, 2026

SIGNATURE

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

\n\n \n \n \n \n \n\n \n \n \n\n \n\n \n\n \n\n \n \n \n \n \n\n \n \n \n \n \n\n \n \n \n \n \n


	*Sun\n Life Financial Inc.* \n (Registrant)



Date:\n October 8, 2026	By:	/s/\n “Kevin Armitage”
		Kevin\n Armitage
		AVP & Managing Counsel, Corporate\n Legal \n\n\n

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