Harold William "Baldy" Cotton (November 5, 1902 – September 9, 1984) was a Canadian professional ice hockey player who played 12 seasons in the National Hockey League for the Pittsburgh Pirates, Toronto Maple Leafs and New York Americans.

Cotton's hockey career began in Pittsburgh after moving there to attend Duquesne University.

In 1925, he began playing for the Pittsburgh Yellow Jackets of the United States Amateur Hockey Association while attending school.

He would later sign with the NHL's Pittsburgh Pirates, playing with the club for parts of 4 seasons.

In 1935, Cotton was sold to the New York Americans where he played for two more seasons until his retirement in 1937.