Queen Mary University of London is a public research university in London, England, and a constituent college of the federal University of London. It dates back to the foundation of London Hospital Medical College in 1785. Queen Mary College, named after Mary of Teck, was admitted to the University of London in 1915 and in 1989 merged with Westfield College to form Queen Mary and Westfield College. In 1995 Queen Mary and Westfield College merged with St Bartholomew's Hospital Medical College and the London Hospital Medical College to form the School of Medicine and Dentistry.

Its main campus is in the Mile End area of Tower Hamlets, with other campuses in Holborn, Smithfield and Whitechapel. It is the only college of the University of London to have an integrated teaching, research and residential campus. In 2011 it had 21,187 students and 4,000 staff. Queen Mary is organised into three faculties – the Faculty of Humanities and Social Sciences, the Faculty of Science and Engineering and Barts and The London School of Medicine and Dentistry – within which there are 21 academic departments and institutes. It is one of the largest colleges of the University of London.

Queen Mary is a member of the Russell Group of leading British research universities, the Association of Commonwealth Universities and Universities UK. Queen Mary is a major centre for medical teaching and research and is part of UCL Partners, the world's largest academic health science centre. It has a strategic partnership with the University of Warwick, including research collaboration and joint teaching of English, history and computer science undergraduates. Queen Mary also collaborates with Royal Holloway, University of London, to run programmes at the University of London Institute in Paris. For 2015-16, Queen Mary had a turnover of £404.3 million, including £101.0 million from research grants and contracts.

Queen Mary is ranked among the top universities in London. According to The Guardian, it has been ranked ahead of other London institutions in the fields of law, dentistry, media and film studies, and second in medicine and history. There are seven Nobel Laureates amongst Queen Mary's alumni and current and former staff.