| Cecily O'Bryen | |
| Nationality: | British |
| Sport: | Diving |
| Birth Date: | 7 September 1899 |
| Birth Place: | Hampstead, Great Britain |
| Death Place: | Watlington, Great Britain |
Cecily O'Bryen (7 September 1899 - 17 March 1984) was a British diver.[1] She competed in the women's 3 metre springboard event at the 1924 Summer Olympics.[2]