Emmett Jerome "Heinie" Mueller (July 20, 1912 – October 3, 1986) was a Major League Baseball player for the Philadelphia Phillies from 1938 to 1941. Born in St. Louis, Missouri, Mueller originally signed as an infielder with the St. Louis Cardinals’ organization. Before reaching the major leagues, Mueller played with Springfield in the Western Association and in 1935 and 1936 with Houston.