Harley Joseph Grossman (May 5, 1930 – September 5, 2003) was an American professional baseball player whose career lasted for five seasons (1949–1953) and who appeared in one Major League game as a relief pitcher for the 1952 Washington Senators. A native of Evansville, Indiana, Grossman attended Ball State University; he stood 6 feet (1.8 m) tall and weighed 170 pounds (77 kg). He then returned to minor league baseball, where he compiled a 42–20 win–loss mark over his first three seasons, and he played no further after the 1953 campaign.