Cardiff University (Welsh: Prifysgol Caerdydd) is a public research university in Cardiff, Wales, United Kingdom. It was established in 1883 as the University College of South Wales and Monmouthshire and became a founding college of the University of Wales in 1893. It merged with the University of Wales Institute of Science and Technology (UWIST) in 1988 as the University of Wales College, Cardiff (University of Wales, Cardiff, from 1996). In 1997 it received degree-awarding powers, but held them in abeyance. It adopted the operating name of Cardiff University in 1999; this became its legal name in 2005, when it became an independent university awarding its own degrees.

Cardiff University is the only Welsh member of the Russell Group of research-intensive British universities. Academics and alumni of the university have included three heads of state or government, two Nobel laureates, 15 fellows of the Royal Society, 11 fellows of the Royal Academy of Engineering, seven fellows of the British Academy, 21 fellows of the Academy of Medical Sciences and 34 fellows of the Academy of Social Sciences.