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). Grimes batted and threw right-handed.

He was born in Minerva, Ohio.

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.

His father Ray Grimes and his uncle Roy Grimes also played in the major leagues.

• List of second-generation Major League Baseball players

• Career statistics from Baseball Reference, or Baseball Reference (Minors)
• Baseball Almanac