| Cecil Duff | |
| Position: | Pitcher |
| Bats: | Left |
| Throws: | Right |
| Birth Date: | November 20, 1896 |
| Birth Place: | Radersburg, Montana |
| Death Place: | Bend, Oregon |
| Debutleague: | MLB |
| Debutdate: | September 5 |
| Debutyear: | 1922 |
| Debutteam: | Chicago White Sox |
| Finalleague: | MLB |
| Finaldate: | September 21 |
| Finalyear: | 1922 |
| Finalteam: | Chicago White Sox |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 1–1 |
| Stat2label: | Earned run average |
| Stat2value: | 4.97 |
| Stat3label: | Strikeouts |
| Stat3value: | 7 |
| Teams: |
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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, 175 pounds. He was born in Radersburg, Montana, and died in Bend, Oregon.