"The Five Doctors" is a special feature-length episode of the British science fiction television series Doctor Who, produced in celebration of the programme's 20th anniversary. It had its world premiere in the United States, on the Chicago PBS station WTTW and various other PBS member stations on 23 November 1983, the anniversary date. It was transmitted on BBC1 in the United Kingdom two days later.

"The Five Doctors" was written by Terrance Dicks, who had been the script editor for the entirety of the Third Doctor's era and had written for the series since the 1960s. The episode aired after the conclusion of the 20th season to celebrate the 20th anniversary. Patrick Troughton and Jon Pertwee reprised their roles as the Second and Third Doctors, respectively. Richard Hurndall portrayed the First Doctor, as the character's original actor, William Hartnell, had died since his last appearance on the show ten years previously. Since Tom Baker decided not to appear in the special, footage from the unfinished serial Shada was used to portray the Fourth Doctor.