Elmer John Smith (September 21, 1892 – August 3, 1984) was an American professional baseball outfielder who played in Major League Baseball for the Cleveland Indians (1914–16, 1917 and 1919–21), Washington Senators (1916–17), Boston Red Sox (1922), New York Yankees (1922–23), and Cincinnati Reds (1925). Smith was a member of the 1920 World Series champions with Cleveland and the 1923 World Series champions with New York. He hit a grand slam in Game 5 of the 1920 World Series, which was the first in World Series history.