John Arthur Stevens, Baron Stevens of Kirkwhelpington KStJ QPM DL FRSA (born 21 October 1942) was Commissioner of Police of the Metropolis (head of the Metropolitan Police Service) from 2000 until 2005. From 1991 to 1996, he was Chief Constable of Northumbria Police before being appointed one of HM Inspectors of Constabulary in September 1996. He was then appointed Deputy Commissioner of the Met in 1998 until his promotion to Commissioner in 2000.
He is now International Security Advisor to the Prime Minister, Gordon Brown, alongside former First Sea Lord and Chief of the Naval Staff, Lord West, who is National Security Advisor.
Stevens was educated at St. Lawrence College, Ramsgate, the University of Leicester where he took an LL.B and the University of Southampton, where he did his MPhil. Before becoming Chief Constable of Northumbria, he served as Assistant Chief Constable of the Hampshire Constabulary (1986-88) and Deputy Chief Constable of the Cambridgeshire Constabulary (1988-91).