Joseph Marvin Coscarart (November 18, 1909 – April 5, 1993) was an infielder in Major League Baseball who played for the Boston Braves from 1935 to 1936.

His younger brother, Pete, was an infielder who played with the Brooklyn Dodgers and Pittsburgh Pirates (1938–1946).

In a two-season career, Coscarart posted a .241 batting average with three home runs and 73 RBI in 190 games played.

Coscarart died in Sequim, Washington, at the age of 83.

This biographical article relating to an American baseball third baseman is a stub.