Gerard Ian Evan FRS, FMedSci (born 17 August 1955) is a British biologist and, since May 2022, Professor of Cancer Biology at King's College London and a principal group leader in the Francis Crick Institute. Prior to this he was Sir William Dunn Professor of Biochemistry and Head of Biochemistry at the University of Cambridge (2009-2022). ^{[11] [13]}

Evan was educated at St Peter's College, Oxford, where he studied Biochemistry, and King's College, Cambridge, where he was awarded his PhD in 1982 for research using Monoclonal antibodies. ^{[10] [14]}

Evan does research to the determine the molecular basis of cancer. ^{[15] [16] [17] [18] [19] [20] [21] [22]}

Prior to Cambridge, Evan was Royal Society Napier Professor at University College London and the Imperial Cancer Research Fund (1988-99), then Gerson & Barbara Bass Bakar Distinguished Professor of Cancer Biology, at University of California, San Francisco (1999-2011).