O'Reilly Island
| Geography | |
|---|---|
| Location | Queen Maud Gulf |
| Coordinates | 68°02′13″N 98°58′53″W / 68.03694°N 98.98139°W |
| Archipelago | Arctic Archipelago |
| Area | 34.6 km2 (13.4 sq mi) |
| Administration | |
Canada | |
| Territory | Nunavut |
O'Reilly Island is an uninhabited island in Nunavut Territory, Canada. It lies to the south of King William Island and to the west of the Klutschak and Adelaide Peninsulas, in the easternmost part of the Queen Maud Gulf.