| Clarrie Riordan | |
| Fullname: | Clarence Hector Riordan |
| Birth Date: | 1 August 1917 |
| Birth Place: | Kyneton, Victoria |
| Originalteam: | Kyneton |
| Height: | 183 cm |
| Weight: | 77 kg |
| Statsend: | 1940 |
| Years1: | 1939–40 |
| Games Goals1: | 13 (0) |
Clarence Hector Riordan (1 August 1917 – 29 September 1995) was an Australian rules footballer who played with St Kilda in the Victorian Football League (VFL).[1]