Harold Gust Carlson (May 17, 1892 – May 28, 1930) was an American professional baseball pitcher in the Major Leagues from 1917 to 1930, for the Chicago Cubs, Philadelphia Phillies, and Pittsburgh Pirates.

He was a strong hitting pitcher in his 14-year major league career, posting a .223 batting average (159-for-712) scoring 58 runs, with 5 home runs and 72 RBI and drawing 24 bases on balls.

Approximately 35 minutes after the team physician was called, Carlson died, just as he was being moved to hospital.

[1] Carlson is buried at Arlington Memorial Park Cemetery in Rockford, Illinois.

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