Walter Hamilton Clarkson (November 3, 1878 – October 10, 1946) was an American pitcher in Major League Baseball.

Clarkson attended Harvard University, where he played college baseball for the Crimson from 1898 to 1903.

[1] Clarkson spent the beginning of 1905 coaching the Army Black Knights baseball team but left the team in March to join the Highlanders for spring training in Montgomery, Alabama.

[2] He was a younger brother of fellow baseball players John and Dad Clarkson, as well as of golf and billiards player T. Henry Clarkson.

This biographical article relating to an American baseball pitcher born in the 1870s is a stub.