David Michael Sisler (October 16, 1931 – January 9, 2011) was a professional baseball pitcher who played in Major League Baseball (MLB) from through . Early in his career, Sisler was a starter, then later was used as a middle reliever and occasionally as a closer. He reached the majors in  with the Boston Red Sox after he completed a two-year obligation in the active military. After three-and-a-half seasons with the Red Sox, he was traded to the Detroit Tigers in and served the team through the  season. Before the  season, he was selected by the Washington Senators in the 1960 Major League Baseball expansion draft, for whom he played the  season. He was then traded to the Cincinnati Reds in , playing one season at the major league level, and one in their minor league system.