Angaur or Ngeaur (アンガウル) is an island in the island nation of Palau. The island, which forms its own state, has an area of 8 km² (3 mi²). Its population is 188 (census of 2002). State capital is the village of Ngeremasch on the western side. A second village, Rois, is immediately east of Ngeremasch.

Angaur is the site of a major World War II battle, and there are many American and Japanese battle relics scattered throughout the island. From to 1909 until 1954 phosphate mining took place on Anguar, originally by Germans, then Japanese, and finally Americans. Angaur is the only place in Micronesia that has feral monkeys; they are descended from macaques released during German occupation. Thus it is also called Monkey Island.

Angaur Island is located southwest of Peleliu, and it is a popular surfing location. Angaur is accessible by boats and small planes. From 1945 to 1978 the U.S. Coast Guard operated a LORAN transmitting station, LORSTA Palau, as part of the worldwide LORAN navigation system. The eastern side of the island is mostly sandy with rocky outcroppings, while the western side of the island has a small lagoon with a small fishing and transportation port. According to the CIA Factbook, the official languages here are Japanese, English, and "Angaur". It is the only place outside of Japan where Japanese is an official language.