| Jack Main | |
| Fullname: | John Alfred Main |
| Birth Date: | 22 June 1876 |
| Birth Place: | Geelong, Victoria |
| Death Place: | Northcote, Victoria |
| Statsend: | 1911 |
| Years1: | 1907 |
| Club1: | South Melbourne |
| Games Goals1: | 1 (1) |
| Years2: | 1911 |
| Club2: | Sturt |
| Games Goals2: | 6 (1) |
John Alfred Main (22 June 1876 – 16 December 1945) was an Australian rules footballer who played with South Melbourne in the Victorian Football League (VFL) and Sturt in the South Australian Football League (SAFL).[1]