Gross v. FBL Financial Services, Inc., 557 U.S. 167 (2009), was a case decided by the Supreme Court of the United States in 2009, involving the standard of proof required for a claim under the Age Discrimination in Employment Act (ADEA).

Gross brought suit against FBL in April 2004 in District Court, claiming ADEA violations.

The United States Court of Appeals for the Eighth Circuit reversed the decision.

The Supreme Court affirmed that reversal, finding that a plaintiff must prove by preponderance of evidence, that age was the "but for" cause of the adverse employment action.

This article related to the Supreme Court of the United States is a stub.