Leslie Grant Nunamaker (January 25, 1889 – November 14, 1938) was an American catcher for the Boston Red Sox (1911–14), New York Yankees (1914–17), St. Louis Browns (1918) and Cleveland Indians (1919–22).

Until being injured in early in the 1912 season against the St. Louis Browns, Nunamaker was Bill Carrigan's primary backup catcher for the Red Sox.

Nunamaker is one of several catchers who hold the major league record for runners thrown out in an inning.

While playing for the New York Yankees in 1914, Nunamaker threw out three baserunners at second base in one inning against the opposing Detroit Tigers, remaining the only catcher ever to accomplish that feat.

This biographical article relating to an American baseball catcher born in the 1880s is a stub.