Series Four of The Apprentice was a British reality television series, which was won by Lee McQueen. The series began on BBC One on 26 March 2008, and ran for twelve weekly episodes. Auditions and interviews are reported to have taken place during the first two weeks of July 2007 in London, Glasgow, Manchester and Bristol. A record 20,000 applications were received.

Sir Alan Sugar reprised his role as the boss, and Nick Hewer and Margaret Mountford again served as his advisers. 'Frances', Sir Alan's boardroom 'receptionist', also returned. The show's spin-off, The Apprentice: You're Fired!, was again hosted by Adrian Chiles. Filming of the first episode of The Apprentice: You're Fired! took place on 25 March 2008. TV presenter Jennifer Maguire also participated in this series.