Charles H. "Cy" Pfirman (February 27, 1889 – May 16, 1937) was a professional baseball umpire who worked in the National League from 1922 to 1936. Pfirman umpired 2,241 major league games in his 15-year career. He also umpired in three World Series (1928, 1933 and 1936) and the 1934 Major League Baseball All-Star Game.