Walter Hamilton Clarkson
- Bats Right, Throws Right
- Height 5' 10", Weight 150 lb.
- School Harvard University
- High School Cambridge High School
- Debut July 2, 1904
- Final Game April 28, 1908
- Born November 3, 1878 in Cambridge, MA USA
- Died October 10, 1946 in Cambridge, MA USA
Walter Clarkson, who was born and died in Cambridge, MA, went to Harvard University from 1898-1903. He made his debut in the majors in 1904, and his 3.17 ERA places him first among pitchers from Harvard (through 2007), while his 18 victories place him second behind Jeff Musselman. He was head coach of the United States Military Academy in 1905.