John A. Kull (born John A. Kolonauski; June 24, 1882 – March 30, 1936) was a Major League Baseball pitcher.

In his one and only career game, he had a 1–0 record, going three innings, and striking out four batters.

He batted and threw left-handed, and singled in his only turn at-bat driving in two runs for an MLB career batting average of 1.000.

[1] Although several dozen pitchers retired with a career winning percentage of 1.000, and numerous batters and fielders retired with career batting and fielding averages of 1.000 (all of whom had very short MLB careers), Kull remains the only MLB player to ever finish his career with a 1.000 mark in all three statistical categories.

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