| Billy Duff | |
| Fullname: | William Francis Andrew Duff |
| Birth Date: | 16 December 1938 |
| Birth Place: | Littleborough, England |
| Death Place: | Rochdale, England |
| Position: | Left winger |
| Years1: | 1956–1958 |
| Caps1: | 0 |
| Goals1: | 0 |
| Years2: | 1958–1960 |
| Caps2: | 0 |
| Goals2: | 0 |
| Years3: | 1960 |
| Clubs3: | Polish White Eagles (Toronto) |
| Years4: | 1960 |
| Caps4: | 3 |
| Goals4: | 1 |
| Years5: | 1960–1961 |
| Caps5: | 14 |
| Goals5: | 3 |
| Years6: | 1961–1963 |
| Years7: | 1963–1964 |
| Caps7: | 15 |
| Goals7: | 3 |
| Totalcaps: | 17 |
| Totalgoals: | 4 |
William Francis Andrew Duff (16 December 1938 — 25 March 2002) was an English professional footballer who played as a left winger in the Football League.