| Leo Duff | |
| Fullname: | Leo Vivian Duff |
| Birth Date: | 18 March 1885 |
| Birth Place: | Unley, South Australia |
| Death Place: | Kew, Victoria |
| Originalteam: | Essendon (VFA) |
| Statsend: | 1908 |
| Years1: | 1908 |
| Games Goals1: | 2 (1) |
Leo Vivian Duff (18 March 1885 – 24 January 1956) was an Australian rules footballer who played with St Kilda in the Victorian Football League (VFL).[1]