(John) Crispian Strachan CBE QPM (born 1949) was Chief Constable of Northumbria Police from 1998 to 2005.
Strachan was born in 1949 and read law at Jesus College, Oxford before receiving an M.A. in Criminology from the University of Sheffield. He became a constable in the Metropolitan Police in 1972, becoming an Inspector in 1977, Chief Inspector in 1983, Superintendent in 1987 and Chief Superintendent in 1990. He trained as a negotiator for hostage situations, and was part of the Royal and Diplomatic Protection service of the Metropolitan Police between 1985 and 1988. In 1993, Strachan became Assistant Chief Constable of Strathclyde Police, moving to Northumbria Police as Chief Constable in 1998. He was awarded the Queen's Police Medal in 1996 and was made a Commander of the Order of the British Empire (CBE) in 2003. He retired in 2005.