| Colin Martyn | |
| Fullname: | Ronald Arthur Colin Martyn |
| Birth Date: | 27 January 1903 |
| Birth Place: | Brunswick, Victoria |
| Death Place: | Lakes Entrance, Victoria |
| Originalteam: | Coburg (VFA) |
| Debutdate: | Round 3, 1928 |
| Debutteam: | Carlton |
| Debutopponent: | Hawthorn |
| Debutstadium: | Glenferrie Oval |
| Height: | 178 cm |
| Weight: | 76 kg |
| Statsend: | 1932 |
| Years1: | 1928–1932 |
| Club1: | Carlton |
| Games Goals1: | 85 (2) |
Ronald Arthur Colin Martyn (27 January 1903 – 11 January 1968) was an Australian rules footballer who played in the Victorian Football League (VFL).
Martyn made his debut for the Carlton Football Club in round 3 of the 1928 season. He left the game at the end of the 1932 season.