Joseph Lawrence Stewart (March 11, 1879 – February 9, 1913), nicknamed "Ace", was a Major League Baseball pitcher who played in 1904 with the Boston Beaneaters.

He batted and threw right-handed.

Stewart had a 0-0 record, with a 9.64 ERA, in 2 games, in his one-year career.

He was born in Monroe, North Carolina and died in Youngstown, Ohio.

This biographical article relating to an American baseball pitcher born in the 1870s is a stub.