6-K

UNITEDSTATES

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

FORM 6-K****

Report of Foreign Private IssuerPursuant to Rule 13a-16 or 15d-16under the Securities Exchange Act of 1934

SUN LIFE FINANCIAL INC.

(the "Company")

(Translation of registrant's name into English)

1York 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 of Form 20-F or Form 40-F.

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):____

SIGNATURE

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.

Exhibit 99.1

****

Sun Life completes offering of Subordinated Unsecured Debentures

TORONTO, Oct. 1, 2020 /CNW/ - Sun Life Financial Inc. (TSX: SLF) (NYSE: SLF) (the "Company") announced today the successful completion of the public offering in Canada of $750 million principal amount of Series 2020-2 Subordinated Unsecured 2.06% Fixed/Floating Debentures due 2035 (the "Debentures").  The net proceeds will be used for general corporate purposes of the Company, which may include investments in subsidiaries, repayment of indebtedness, and other strategic investments.

The Debentures were sold under a pricing supplement dated September 29, 2020, issued pursuant to its short form base shelf prospectus and its prospectus supplement, each dated March 28, 2019, all of which are available on the SEDAR website for the Company at www.sedar.com.

The Debentures have not been and will not be registered under the United States Securities Act of 1933, as amended, and may not be offered, sold or delivered, directly or indirectly, within the United States of America and its territories and possessions or to, or for the account or benefit of, United States persons except in certain transactions exempt from the registration requirements of such Act. This release does not constitute an offer to sell or a solicitation to buy such securities in the United States.

About Sun LifeSun Life is a leading international financial services organization providing a diverse range of insurance, wealth and asset management solutions to individual and corporate Clients. Sun Life has operations in a number of markets worldwide, including Canada, the United States, the United Kingdom, Ireland, Hong Kong, the Philippines, Japan, Indonesia, India, China, Australia, Singapore, Vietnam, Malaysia and Bermuda. As of June 30, 2020, Sun Life had total assets under management of $1,122 billion. For more information please visit www.sunlife.com.

Sun Life Financial Inc. trades on the Toronto (TSX), New York (NYSE) and Philippine (PSE) stock exchanges under the ticker symbol SLF.

Note to editors: All figures in Canadiandollars

View original content to download multimedia:http://www.prnewswire.com/news-releases/sun-life-completes-offering-of-subordinated-unsecured-debentures-301143893.html

SOURCE Sun Life Financial Inc.

View original content to download multimedia: http://www.newswire.ca/en/releases/archive/October2020/01/c9687.html

%CIK: 0001097362

CO: Sun Life Financial Inc.

CNW 08:45e 01-OCT-20