Nestegis sandwicensis, commonly known as Hawai'i olive' or olopua, is a species of flowering tree in the olive family, Oleaceae, that is endemic to Hawaii. It is found on all major islands at elevations of 30–1,300 m (98–4,265 ft) in coastal mesic and mixed mesic forests, and, especially, dry forests. It usually reaches a height of 6 m (20 ft) with a trunk diameter of 0.2 m (0.66 ft), but may reach 20 m (66 ft) in height with a trunk diameter of 0.9 m (3.0 ft).