Company: SLFQF
Filing Date: 2025-02-13
Form Type: 6-K
Source: 0001279569-25-000135
Chunk: 0

Company: SUN LIFE FINANCIAL INC
Filing Date: 2025-02-13
Form: 6-K
Chunk 0
---
<div align='center'>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</div>

| For the month    
 of February 2025 | Commission File Number: 001-15014 |

<div align='center'>SUN LIFE FINANCIAL INC.

(Translation of registrant's name into English)

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

(Address of principal executive offices)</div>

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

| Form 20-F 
 ☐         |     | Form 40-F 
 ☒         |

<div align='center'>SIGNATURE</div>

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, thereunto duly authorized.

| Date:             
 February 12, 2025 |     | Sun                 
 Life Financial Inc. 
 (Registrant)        
 By:                 |     | /s/                      
 “Tracie Allan”           |
|:------------------|:----|:--------------------|:----|:-------------------------|
|                   |     |                     |     | Tracie Allan             |
|                   |     |                     |     | VP, Associate General    
 Counsel, Corporate Legal |