Macadamia is a genus of four species of trees in the flowering plant family Proteaceae. They are indigenous to Australia, native to northeastern New South Wales and central and southeastern Queensland specifically. Two species of the genus are commercially important for their fruit, the macadamia nut (or simply macadamia). Global production in 2015 was 160,000 tonnes (180,000 short tons). Other names include Queensland nut, bush nut, maroochi nut, bauple nut and, in the USA, they are also erroneously known as Hawaii nut. In Australian Aboriginal languages, the fruit is known by names such as bauple, gyndl or jindilli (north of Great Dividing Range) and boombera (south of the Great Range). It was an important source of bushfood for the Aboriginal peoples who are the original inhabitants of the area.

The nut was first commercially produced on a wide scale in Hawaii, where Australian seeds were introduced in the 1880s, and for some time, they were the world's largest producer. South Africa has been the world's largest producer of the macadamia since the 2010s.