Grover Cleveland "Slim" Lowdermilk (January 15, 1885 – March 31, 1968) was an American Major League Baseball pitcher with the St. Louis Cardinals, Chicago Cubs, St. Louis Browns, Detroit Tigers, Cleveland Indians and Chicago White Sox between 1909 and 1920.

Lowdermilk batted and threw right-handed.

He was born in Sandborn, Indiana.

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