Henry Joseph Thielman (October 3, 1880 – September 2, 1942) was a pitcher in Major League Baseball.

After being released in May, he finished out the season with the Cincinnati Reds, going 9-15 with a 3.24 earned run average.

Thielman pitched for the Eastern League's Jersey City Skeeters from 1903–1906.

After being released by Brooklyn, he went 23-5 for the Skeeters the rest of the season and led the EL in winning percentage.

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