The University of Adelaide (informally Adelaide University) is a public research university located in Adelaide, South Australia. Established in 1874, it is the third-oldest university in Australia. The university's main campus is located on North Terrace in the Adelaide city centre, adjacent to the Art Gallery of South Australia, the South Australian Museum, and the State Library of South Australia.

The university has four campuses, three in South Australia: North Terrace campus in the city, Roseworthy campus at Roseworthy and Waite campus at Urrbrae, and one in Melbourne, Victoria. The university also operates out of other areas such as Thebarton, the National Wine Centre in the Adelaide Park Lands, and in Singapore through the Ngee Ann-Adelaide Education Centre.

The University of Adelaide is composed of three faculties, with each containing constituent schools. These include the Faculty of Sciences, Engineering and Technology (SET), the Faculty of Health and Medical Sciences, and the Faculty of Arts, Business, Law and Economics (ABLE). It is a member of the Group of Eight and the Association of Commonwealth Universities. The university is also a member of the Sandstone universities, which mostly consist of colonial-era universities within Australia.

The university is associated with five Nobel laureates, constituting one-third of Australia's total Nobel Laureates, and 114 Rhodes scholars. The university has generated a considerable impact on the public life of South Australia, having educated many of the state's leading businesspeople, lawyers, medical professionals and politicians. The university has been associated with many notable achievements and discoveries, such as the discovery and development of penicillin, the development of space exploration, sunscreen, the military tank, Wi-Fi, polymer banknotes and X-ray crystallography, and the study of viticulture and oenology.