Jewel Winklemeyer Ens (August 24, 1889 – January 17, 1950) was an American infielder, manager and coach in Major League Baseball. Born in St. Louis, Missouri, Ens served the Pittsburgh Pirates as a utility infielder (1922–25), player-coach (1923–25), coach (1926–29; 1935–39) and manager (1929–31). He was a member of the 1925 World Series champion Pirates and their 1927 National League championship edition. He managed the Pirates from August 28, 1929, through the end of the 1931 season, leading them to a 176–167 record (.513) with two fifth-place finishes in the eight-team NL during his two full seasons as skipper.