Seymour Greenberg (August 10, 1920 in Chicago, Illinois – March 3, 2006 in Park Ridge, Illinois) was an amateur American clay-court specialist tennis player in the 1940s and 1950s. Greenberg was ranked U.S. No. 5 in singles in 1943 and 1944, and also in 1942, 1945, and 1947.