Frank Blaine Withrow (June 14, 1891 – September 5, 1966), nicknamed "Kid", was a professional baseball player.

He played two seasons, 1920 and 1922, in Major League Baseball for the Philadelphia Phillies, primarily as a catcher.

He batted and threw right-handed.

Withrow was born in Greenwood, Missouri, and died in Omaha, Nebraska.

This biographical article relating to an American baseball catcher born in the 1890s is a stub.