Donald Louis Mossi (January 11, 1929 – July 19, 2019) was an American major league pitcher from 1954 to 1965. He was a left-handed control pitcher. He played for the Cleveland Indians (1954–1958), Detroit Tigers (1959–1963), Chicago White Sox (1964) and for the Kansas City Athletics (1965). Mossi was born in St. Helena, California.