Ulster University (Irish: Ollscoil Uladh; Ulster Scots: Ulstèr Universitie or Ulstèr Varsitie), legally the University of Ulster, is a multi-campus public university located in Northern Ireland. It is often referred to informally and unofficially as Ulster, or by the abbreviation UU. It is the largest university in Northern Ireland and the second-largest university on the island of Ireland, after the federal National University of Ireland.

Established in 1865 as Magee College, the college took its modern form in 1984 after the merger of the New University of Ulster established in 1968 and Ulster Polytechnic, incorporating its four Northern Irish campuses under the University of Ulster banner. The university incorporated its four campuses in 1984; located in Belfast, Coleraine, Derry (Magee College), and Jordanstown. The university has branch campuses in both London and Birmingham, and an extensive distance learning provision. The university rebranded as Ulster University from October 2014 and this included a revised visual identity, though its legal name remained unchanged.

It has one of the highest further study and employment rates in the UK, with over 92% of graduates being in work or further study six months after graduation. The university is a member of the Association of Commonwealth Universities, the European University Association, Universities Ireland and Universities UK.