Tariq Ramadan is a Swiss Muslim academic, philosopher, and writer. He was a professor of contemporary Islamic studies at St Antony's College, Oxford and the Faculty of Theology and Religion, University of Oxford, but since 2018 has been taking an agreed leave of absence due to being held in prison following two rape allegations. He is a senior research fellow at Doshisha University in Japan, and is also a visiting professor at the Université Mundiapolis in Morocco. He was a visiting professor at the Faculty of Islamic Studies at Hamad Bin Khalifa University in Qatar, and used to be the director of the Research Centre of Islamic Legislation and Ethics (CILE), based in Doha. He is a member of the UK Foreign Office Advisory Group on Freedom of Religion or Belief. He was listed by Time magazine in 2000 as one of the seven religious innovators of the 21st century and in 2004 as one of the 100 most influential people in the world and was voted by Foreign Policy readers (2005, 2006, 2008–2010, 2012–2015) as one of the top 100 most influential thinkers in the world and Global Thinkers. Ramadan describes himself as a "Salafi reformist.'

Tariq Ramadan was born in Geneva, Switzerland on 26 August 1962 to an Egyptian Muslim family. He is the son of Said Ramadan and Wafa al-Banna, who was the eldest daughter of Hassan al Banna, who in 1928 founded the Muslim Brotherhood in Egypt. Gamal al-Banna, the liberal Muslim reformer, was his great-uncle. His father was a prominent figure in the Muslim Brotherhood and was exiled by Gamal Abdel Nasser from Egypt to Switzerland, where Ramadan was born.

Tariq Ramadan holds an M.A. in French literature and a Ph.D. in Arabic and Islamic studies at the University of Geneva. He also wrote a Ph.D. dissertation on Friedrich Nietzsche, titled Nietzsche as a Historian of Philosophy. In 1994, he addressed a French-speaking public audience, in Switzerland, with the help of Hassan Iquioussen and Malika Dif.

He taught at the Collège de Saussure, a high school in Lancy, Switzerland, and claims to have held a lectureship in Religion and Philosophy at the University of Fribourg from 1996 to 2003, something the university publicly denied in 2018. He was appointed a professor at the University of Notre Dame in the United States in 2004 before his visa had been revoked by the Bush administration because of the Patriot Act. In October 2005 he began teaching at St Antony's College, Oxford, on a visiting fellowship. In 2005 he was a senior research fellow at the Lokahi Foundation.

In 2007 he successfully applied for the professorship in Islamic studies at the University of Leiden. This led to severe criticism from both academics as well as politicians who deemed Ramadan a 'radical Islamist' and a 'wolf in sheep's clothing'. Ramadan later turned down the appointment, stating that the criticism on his appointment played no role in this decision. He was also a guest professor of Identity and Citizenship at Erasmus University Rotterdam, until August 2009 when both the City of Rotterdam and Erasmus University dismissed him from his positions as "integration adviser" and professor, stating that the program he hosted on Iran's Press TV, Islam & Life, was "irreconcilable" with his duties in Rotterdam. Ramadan described this move as 'Islamophobic' and 'politically charged'. In 2012 the Court of Rotterdam District ruled in a civil law case that the Erasmus University acted "carelessly" by dismissing Ramadan at short notice. The dismissal by the municipality of Rotterdam, however, was not careless according to the Court.

Beginning September 2009, Ramadan was appointed to the chair in Contemporary Islamic Studies at Oxford University.

Ramadan established the Mouvement des Musulmans Suisses (Movement of Swiss Muslims), which engages in various interfaith seminars. He is an advisor to the EU on religious issues and was sought for advice by the EU on a commission on "Islam and Secularism". In September 2005 he was invited to join a task force by the government of the United Kingdom. He is also the founder and President of the European Muslim Network, a Brussels-based think-tank that gathers European Muslim intellectuals and activists.

As of 2009, Tariq Ramadan was persona non grata in Tunisia, Egypt, Saudi Arabia, Libya, and Syria, which he has said is because of his criticism of their "undemocratic regimes". He is also considered persona non grata in Israel.

Tariq Ramadan married in 1986 and is the father of four children. His wife was born in Bretagne, France. She converted from Catholicism to Islam and adopted the name Iman. The couple live separately.

In January 2014, Ramadan was nominated for the title of Religious Advocate of the Year at the British Muslim Awards.

Ramadan has authored around 30 books as well as "several hundred articles" in French and English, some of which have been translated into other languages.