Doctor Who is a British science fiction television series produced by the BBC about a mysterious time-travelling adventurer known only as "The Doctor." It is also the title of a 1996 television movie featuring the same character.

The programme is a significant part of British popular culture, widely recognised for its creative storytelling, use of innovative music (produced by the BBC Radiophonic Workshop) and low-budget special effects. The show has become a cult television favourite on par with Star Trek. It has influenced generations of British genre television writers, many of whom grew up watching the series. Doctor Who ranked third in a list of the 100 Greatest British Television Programmes of the 20th century. The list was produced by the British Film Institute in 2000 and voted on by industry professionals.