| Ern O'Regan | |
| Fullname: | Ernst William Gilbert O'Regan |
| Birth Date: | 23 January 1907 |
| Birth Place: | South Australia |
| Death Place: | South Australia[1] |
| Originalteam: | Port Adelaide |
| Height: | 183 cm |
| Weight: | 71 kg |
| Statsend: | 1931 |
| Years1: | 1929–1930 |
| Games Goals1: | 34 |
| Years2: | 1931 |
| Games Goals2: | 1 (0) |
Ernst William Gilbert O'Regan (23 January 1907 – 22 August 1996) was an Australian rules footballer who played with Carlton in the Victorian Football League (VFL).[2]