Mark S. Polhemus (October 14, 1860 – November 14, 1923) nicknamed "Humpty Dumpty", was a Major League Baseball player.

Polhemus started the 1887 season with Haverhill of the New England League.

He hit .456 in 51 games and was then acquired by the major league Indianapolis Hoosiers.

[1] In 1889, he played for the New Orleans Pelicans of the Southern League; he had another good season at the plate, leading the league in batting average, hits, doubles, and runs scored.

This biographical article relating to an American baseball outfielder born in the 1860s is a stub.