| Otterøya | |
| Mapframe-Zoom: | 8 |
| Location: | Trøndelag, Norway |
| Coordinates: | 64.4918°N 11.3561°W |
| Area Km2: | 143 |
| Length Km: | 25 |
| Width Km: | 6 |
| Elevation M: | 446 |
| Highest Mount: | Tømmervikfjellet |
| Country: | Norway |
| Country Admin Divisions Title: | County |
| Country Admin Divisions: | Trøndelag |
| Country Admin Divisions Title 1: | Municipality |
| Country Admin Divisions 1: | Namsos Municipality |
| Population: | 809 |
| Population As Of: | 2001 |
| Density Km2: | 5.7 |
Otterøya[1] is an island in Namsos Municipality in Trøndelag county, Norway. The 143km2 island is the largest island in the northern part of Trøndelag county. Otterøya sits just to the northwest of the town of Namsos on the north side of the Namsenfjorden. It is connected to the mainland by the Lokkaren Bridge. The island was once governed by Otterøy Municipality and Fosnes Municipality, and became a part of Namsos Municipality in 1964. Otterøy Church is located on the island.[2]