James Sloan Baumer (January 29, 1931 - July 8, 1996) was an American infielder and front office executive in Major League Baseball. A righthanded-hitting shortstop born in Tulsa, Oklahoma, Baumer had a highly unusual major league playing career. After reaching the majors at age 18 with the 1949 Chicago White Sox, Baumer hit .400 (four hits in ten at bats, including a double and a triple). He then disappeared into the minor leagues and would not return to MLB until, as a 30-year-old, he had a brief trial with the 1961 Cincinnati Reds before he was traded to the Detroit Tigers for first baseman Dick Gernert and returned to the minor leagues. Overall, he batted .206 in 18 games and 34 at bats, with two runs batted in.