David Arthur Roberts (September 11, 1944 – January 9, 2009) was an American professional baseball player. He played in Major League Baseball as a left-handed pitcher from 1969 to 1981 for eight teams. He was second in the National League (NL) with a 2.10 earned run average (ERA) in 1971 for the San Diego Padres, after which he was traded to the Houston Astros, where he spent the four most productive years of his career. Roberts was also a member of the 1979 World Series winning Pittsburgh Pirates team. Over his major league career he won 103 games.