Oscar Ray Grimes Jr. (April 13, 1915 – May 19, 1993) was a 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 and player information from Baseball Reference, or Baseball Reference (Minors)
• Baseball Almanac
• Baseball Library
• Oscar Grimes at Find a Grave

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