John Leo Mokan (September 23, 1895 – February 10, 1985) was a Major League Baseball outfielder.

A native of Buffalo, New York, Mokan made his major league debut on April 15, 1921 at the age of 25.

He spent seven seasons in the National League with the Pittsburgh Pirates (1921–22) and Philadelphia Phillies (1923–27).

Mokan was a .291 career hitter with 32 home runs and 273 RBI in 582 games.

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