Cecil Elba Duff (November 20, 1896 – November 10, 1969) was an American baseball pitcher for the Chicago White Sox, who made three appearances for the team in 1922 at the age of 25. He batted left-handed and threw right-handed. Duff was 6 ft 1 in (1.85 m), 175 pounds. He was born in Radersburg, Montana, and died in Bend, Oregon.