The University of Warsaw (Polish: Uniwersytet Warszawski, Latin: Universitas Varsoviensis), established in 1816, is the largest university in Poland. It employs over 6,000 staff, including over 3,100 academic educators. It provides graduate courses for 53,000 students (on top of over 9,200 postgraduate and doctoral candidates). The university offers some 37 different fields of study, 18 faculties and over 100 specializations in the humanities, technical, and the natural sciences.It was founded as a Royal University on 19 November 1816, when the Partitions of Poland separated Warsaw from the oldest and most influential Jagiellonian University of Kraków. Alexander I granted permission for the establishment of five faculties – law and political science, medicine, philosophy, theology and the humanities. The university expanded rapidly but was closed during November Uprising in 1830. It was reopened in 1857 as the Warsaw Academy of Medicine, which was now based in the nearby Staszic Palace with only medical and pharmaceutical faculties. All Polish-language campuses were closed in 1869 after the failed January Uprising, but the university managed to train 3,000 students, many of whom were important part of the Polish intelligentsia; meanwhile the Main Building was reopened for training military personnel. The university was resurrected during the First World War and the number of students reached 4,500 in 1918. By the early 1930s it became the country's largest institution of higher learning. Following the Second World War and the devastation of Warsaw, the university successfully reopened in 1945.

Today, the University of Warsaw consists of 126 buildings and educational complexes with over 18 faculties: biology, chemistry, journalism and political science, philosophy and sociology, physics, geography and regional studies, geology, history, applied linguistics and philology, Polish language, pedagogy, economics, law and public administration, psychology, applied social sciences, management and mathematics, computer science and mechanics.

The University of Warsaw is one of the top Polish universities. It was ranked by Perspektywy magazine as best Polish university in 2010, 2011, 2014, and 2016. International rankings such as ARWU and University Web Ranking rank the university as the best Polish higher level institution.

On the list of 100 best European universities compiled by University Web Ranking, the University of Warsaw was placed as 61st. QS World University Rankings previously positioned the University of Warsaw as the best higher level institution among the world's top 400.