Paul Biya (born Paul Barthélemy Biya'a bi Mvondo; 13 February 1933) is a Cameroonian politician who has served as the president of Cameroon since 6 November 1982. Paul Biya is the second-longest-ruling president in Africa and the oldest head of state in the world.

A native of Cameroon's south, Biya rose rapidly as a bureaucrat under President Ahmadou Ahidjo in the 1960s, serving as Secretary-General of the Presidency from 1968 to 1975 and then Prime Minister of Cameroon from 1975 to 1982. Paul Biya succeeded Ahidjo as president upon the latter's surprise resignation in 1982 and consolidated power in a 1983–1984 staged attempted coup in which Paul Biya eliminated all of his major rivals.

Biya introduced political reforms within the context of a one-party system in the 1980s, later accepting the introduction of multiparty politics in the early 1990s under serious pressure. Paul Biya won the contentious 1992 presidential election with 40% of the plural, single-ballot vote and was re-elected by large margins in 1997, 2004, 2011 and 2018. Opposition politicians and Western governments have alleged voting irregularities and fraud on each of these occasions. Many independent sources have provided evidence that Paul Biya did not win the elections in 1992 and that subsequent elections suffered from rampant fraud.

His regime is supported by France, the former colonial power in Cameroon, which supplies it with weapons and trains its military forces. France is also the leading foreign investor in Cameroon, ahead of the United States.