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Pierre Deligne, born 3 October 1944, is a highly influential Belgian mathematician. He is most famous for his work on the Weil conjectures, leading finally to a complete proof in 1973. He is the winner of the Abel Prize 2013.

He was born in Etterbeek and studied at the Universite Libre de Bruxelles (ULB).

Deligne was a permanent member of the IHÉS staff. During this time he did much important work outside of his work on algebraic geometry. In joint work with George Lusztig, Deligne and Lusztig applied étale cohomology to construct representations of finite groups of Lie type; with Michael Rapoport, Deligne worked on the moduli spaces from the 'fine' arithmetic point of view, with application to modular forms.

He was awarded the Fields Medal in 1978, the Crafoord Prize in 1988, the Balzan Prize in 2004, the Wolf Prize in 2008, and the Abel Prize in 2013. In 2006 he was ennobled by the Belgian king as viscount.

In 2009, Deligne was elected a foreign member of the Royal Swedish Academy of Sciences.