Douglas Reagan Ault (March 9, 1950 – December 22, 2004) was an American professional baseball first baseman and designated hitter who played for the Texas Rangers (1976) and Toronto Blue Jays (1977–1978, 1980).
He is best known for playing in the Blue Jays first Major League Baseball (MLB) game on April 7, 1977, against the Chicago White Sox.
Ault hit the first two home runs in franchise history, helping Toronto win 9–5.