David Arthur McNally (October 31, 1942 – December 1, 2002) was an American professional baseball player. He played in Major League Baseball as a left-handed pitcher from 1962 through 1975, most notably as a member of the Baltimore Orioles dynasty that won four American League pennants and two World Series championships between 1966 and 1971. A three-time All-Star, McNally won 20 or more games for four consecutive seasons from 1968 through 1971. He was one of four 20-game winners for the 1971 Orioles (Pat Dobson, Jim Palmer, and Mike Cuellar were the other three).