Stanley Camfield Hack (December 6, 1909 – December 15, 1979), nicknamed "Smiling Stan," was an American third baseman and manager in Major League Baseball who played his entire career for the Chicago Cubs and was the National League's top third baseman in the late 1930s and early 1940s. Usually a leadoff hitter, he batted .301 lifetime, scored 100 runs seven times and led the NL in hits and stolen bases twice each.