UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported): September 19, 2013

REINSURANCE GROUP OF AMERICA, INCORPORATED

(Exact Name of Registrant as Specified in its Charter)

1370 Timberlake Manor Parkway, Chesterfield, Missouri 63017

(Address of Principal Executive Office)

Registrant’s telephone number, including area code: (636) 736-7000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 1.01 Entry into a Material Definitive Agreement.

On September 19, 2013, Reinsurance Group of America, Incorporated (the “Company”) entered into an Underwriting Agreement (the “Underwriting Agreement”) with J. P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated and UBS Securities LLC, as Representatives of the several underwriters named therein (the “Underwriters”), pursuant to which the Company agreed to issue and sell to the Underwriters $400,000,000 aggregate principal amount of its 4.70% Senior Notes due 2023 (the “Securities”). The public offering price of the Securities was 99.623% of the principal amount. The Company expects net proceeds (before expenses) from the offering of the Securities of approximately $395.9 million and to use the proceeds for general corporate purposes.

This offering is being made pursuant to the Company’s automatic shelf registration statement on Form S-3 (Registration No. 333-176104) and a related prospectus supplement, each filed with the Securities and Exchange Commission.

The Underwriting Agreement includes customary representations, warranties and covenants by the Company. Under the terms of the Underwriting Agreement, the Company has agreed to indemnify the Underwriters against certain liabilities under the Securities Act of 1933, as amended, or contribute to payments which the Underwriters may be required to make in that respect. The foregoing description of the Underwriting Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of such document, a copy of which is attached to this Current Report on Form 8-K as Exhibit 1.1.

The Underwriters and/or their affiliates have provided and in the future may provide investment banking, commercial banking, advisory, reinsurance and/or other financial services to the Company and its affiliates for which they have received and in the future may receive customary fees and expenses and may have entered into and in the future may enter into other transactions with the Company.

Item 8.01 Other Events.

On September 19, 2013, the Company issued a press release announcing the pricing of the offering of the Securities. A copy of that press release is attached hereto as Exhibit 99.1.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

See Exhibit Index.

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 hereunto duly authorized.

EXHIBIT INDEX