| Arboretum Island | |
| Map: | Turkey Istanbul |
| Location: | Ümraniye, Istanbul Province, Turkey |
| Coords: | 40.9967°N 29.1181°W |
| Area: | 32ha |
| Created: | 2002 |
| Operator: | TEMA Foundation |
Arboretum Island (Turkish: Arboretum Adası), aka Nezahat Gökyiğit Botanical Garden (Turkish: Nezahat Gökyiğit Botanik Bahçesi), is an arboretum located in Ümraniye district Istanbul Province, Turkey.
Opened in 2002 to the public, it was named in honor of Nezhat Gökyiğit, spouse of Turkish businessman Nihat Gökyiğit. It contains about 50,000 plants in an area covering 32ha.