Donald Clement Klosterman (January 18, 1930 – June 7, 2000) was one of professional football's most accomplished executives, building teams in three different leagues after a serious accident ended his playing career as a quarterback and left his legs partially paralyzed. In the 1960s, Klosterman helped the American Football League (AFL, 1960–1969) overtake the NFL during the bidding wars that led the older league to seek a merger with the AFL. In the 1970s. he was a successful general manager for the NFL's Baltimore Colts and Los Angeles Rams, and in the 1980s he signed all-American quarterback Steve Young to a stunning contract in the United States Football League (USFL).