Oscar Ray Grimes Jr. (April 13, 1915 – May 19, 1993) was an American utility infielder in Major League Baseball who played for the Cleveland Indians (1938–1942), New York Yankees (1943–1946) and Philadelphia Athletics (1946).

In a nine-season career, Grimes posted a .256 batting average with 18 home runs and 200 RBI in 602 games played.

Grimes died in Westlake, Ohio, at the age of 78.

He played semi-pro football for the Minerva Merchants.

This biographical article relating to an American baseball third baseman is a stub.