Hubert Benjamin "Dutch" Leonard, (April 16, 1892 – July 11, 1952) was an American left-handed pitcher in Major League Baseball who had an 11-year career from 1913 to 1921, and 1924 to 1925. He played for the Boston Red Sox and Detroit Tigers, and holds the major league modern-era record for the lowest single-season ERA of all time — 0.96 in 1914. He is not to be confused with Emil "Dutch" Leonard, a right-handed pitcher who pitched in the major leagues between 1933 and 1953.