David Paul Leiper (born June 18, 1962) is an American former professional baseball pitcher. He played in Major League Baseball (MLB) for the Oakland Athletics (1984, 1986–87 and 1994–95), San Diego Padres (1987–89), Montreal Expos (1995 and 1996), and Philadelphia Phillies (1996). In 8 seasons he had a win–loss record of 12–8 in 264 games, 65 games finished, 7 saves, 278 innings pitched, 282 hits allowed, 141 runs allowed, 123 earned runs allowed, 25 home runs allowed, 114 walks, 150 strikeouts, 12 wild pitches, 17 intentional walks, 3 balks, 3.98 ERA and a WHIP of 1.424.