John Creasey MBE (17 September 1908 – 9 June 1973) was an English crime and science fiction writer who wrote more than six hundred novels using twenty-eight different pseudonyms.

He created several characters which are now famous, such as The Toff (The Honourable Richard Rollison), Commander George Gideon of Scotland Yard, Inspector Roger West, The Baron (John Mannering), Doctor Emmanuel Cellini and Doctor Stanislaus Alexander Palfrey. The most popular of these was Gideon of Scotland Yard, who was the basis for the television series Gideon's Way and for the John Ford movie Gideon of Scotland Yard (1958), also known by its British title Gideon's Day. The Baron character was also made into a 1960s TV series starring Steve Forrest as The Baron.