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Blake's 7 (sometimes styled Blakes7) is a British science fiction television series produced by the BBC. Four 13-episode series were broadcast on BBC1 between 1978 and 1981. It was created by Terry Nation, produced by David Maloney (Seasons 1-3) and Vere Lorrimer (Season 4), and the script editor throughout its run was Chris Boucher. The main character, at least initially, was Roj Blake, played by Gareth Thomas. The series was inspired by various fictional media, including Robin Hood, Star Trek, Passage to Marseille, The Dirty Dozen, Brave New World and classic Western stories, as well as real-world political conflicts in South America and Israel.

Four series of thirteen 50-minute episodes were made, and first broadcast in the United Kingdom between January 1978 and December 1981 by BBC1. They are set in the third century of the second calendar (this is mentioned in associated publicity material, not in the series) and at least 700 years in the future. Blake's 7's narrative concerns the exploits of political dissident Roj Blake, who commands a small group of rebels against the forces of the totalitarian Terran Federation that rules the Earth and many colonised planets. The Federation uses mass surveillance, brainwashing and drug pacification to control its citizens. Blake was arrested, tried on false charges, and deported to a remote penal colony. En route, he and fellow prisoners Jenna Stannis and Kerr Avon gain control of a technologically advanced alien spacecraft, which its central computer Zen informs is named Liberator. Liberator's speed and weaponry are superior to Federation craft, and it also has a teleportation system that enables transport to the surface of planets. Blake and his crew begin a campaign to damage the Federation, but are pursued by Space Commander Travis—a Federation soldier—and Servalan, the Supreme Commander and later Federation President.