| Location: | Troms, Norway |
| Coordinates: | 70.0523°N 18.7225°W |
| Area Km2: | 80.6 |
| Length Km: | 14 |
| Width Km: | 10 |
| Elevation M: | 694 |
| Highest Mount: | Geittinden |
| Country: | Norway |
| Country Admin Divisions Title: | County |
| Country Admin Divisions: | Troms |
| Country Admin Divisions Title 1: | Municipality |
| Country Admin Divisions 1: | Karlsøy and Tromsø |
| Population: | 53 |
| Population As Of: | 2024 |
| Density Km2: | 1.7 |
or) is an island in Troms county, Norway. The southern third of the 80.6km2 island is part of Tromsø Municipality while the northern (larger) portion of the island is part of Karlsøy Municipality. There is a regular ferry connection from Bromnes on the eastern end on Rebbensøya to Mikkelvik on the northwestern end of the neighboring island of Ringvassøya.[1]
On Rebbenesøya, there are many mountains that are suitable for tourists who enjoy the outdoors and hiking. The highest point on the island is Geittinden at a height of . There are also about 20 fishing lakes. The uninhabited island nature reserve of Sørfugløya lies off the north-west coast.
The island's school is in Skogvika; it had six students in the 2012/2013 school year. The island also has a convenience store located in Engvika.
Twelve Norwegian commandos from Company Linge were attacked by a German minesweeper in Toftefjord on the island of Rebbenesøya on 30 March 1943. The only man who escaped was Jan Baalsrud. Over a period of three months and enduring harsh conditions, he was aided by patriots in escaping to Sweden. A monument to those killed is located in Toftefjord.