Ronald Ralph Moeller (October 13, 1938 – November 2, 2009) was a pitcher in Major League Baseball who played between 1956 and 1963 for the Baltimore Orioles (1956, 1958), Los Angeles Angels (1961 and 1963) and Washington Senators (1963). Listed at 6 feet (1.8 m) tall and 180 pounds (82 kg), Moeller batted and threw left-handed. He was born in Cincinnati. Moeller died in his native Cincinnati at the age of 71.