John William "Ziggy" Sears (January 10, 1892 – December 16, 1956) was a professional baseball umpire who worked in the National League from 1934 to 1945. Sears umpired 1,647 major league games in his 12-year career. He umpired in two World Series (1938 and 1944) and two All-Star Games (1935 and 1944). He also was a minor league baseball outfielder for 15 seasons between 1912 and 1928.