Oʻahu (often spelled Oahu) is the third largest of the Hawaiian Islands, in the United States. It means "the gathering place" (a place where people meet) in the Hawaiian language. Most of the people of Hawaii live there (1.0 million of the state's 1.4 million in 2020). The total land area is 608 square miles (1,570 km²). Honolulu, the capital city of Hawaii, is on this island. Other well-known places on Oʻahu are Waikīkī, Pearl Harbor, Diamond Head, Hanauma Bay, Kaneohe Bay, and both the North Shore and Makaha (which are famous for very big ocean waves).

Kamehameha I made Oʻahu his capital when he became the first king of Hawaii. Iolani Palace was built later on by others of the royal family. It is the only royal palace on American soil.

Oʻahu was perhaps the first of the Hawaiian Islands which the crew of HMS Resolution saw on 18 January 1778. This was during Captain James Cook's third Pacific Ocean trip. Europeans did not land on Oʻahu until 28 February 1779 when Captain Clerke of the HMS Resolution stepped ashore at Waimea Bay. Clerke took command of the ship after Captain Cook was killed at Kealakekua Bay on February 14.

Today, Oʻahu has become a tourism and shopping center. Almost 7 million visitors (mainly from the American mainland and Japan) go there every year to enjoy the special island holiday found only in Hawaii.

Oʻahu can be seen in hundreds of movies and TV shows. Some of them are Magnum, P.I., Lost, Hawaii Five-O and Jake and the Fatman.

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