1966 (releases)


 * 1 January - "Volcano" debuted on BBC1.
 * 8 January - "Golden Death" debuted on BBC1.
 * 15 January - "Escape Switch" debuted on BBC1 as the 100th episode released.
 * 15 January - The final part of COMIC: "A Christmas Story" was released.
 * 22 January - "The Abandoned Planet" debuted on BBC1.
 * 22 January - The first part of COMIC: The Didus Expedition was released.
 * 29 January - "Destruction of Time" debuted on BBC1.
 * 5 February - "War of God" debuted on BBC1.
 * 12 February - "The Sea Beggar" debuted on BBC1.
 * 12 February - The final part of COMIC: The Didus Expedition was released.
 * 19 February - "Priest of Death" debuted on BBC1.
 * 19 February - The first part of COMIC: Space Station Z-7 was released.
 * 26 February - "Bell of Doom" debuted on BBC1.
 * Dalek Action Paint 'n Puzzle was published by Souvenir Press.
 * Dr. Who Travels in Space Sticker Fun Book was published.
 * Dr. Who Travels in Time Sticker Fun Book was published.
 * 5 March - "The Steel Sky" debuted on BBC1.
 * 12 March - "The Plague" debuted on BBC1.
 * 12 March - The final part of COMIC: The Didus Expedition was released.
 * 19 March - "The Return" debuted on BBC1.
 * 19 March - The first part of COMIC: Plague of the Black Scorpi was released.
 * 26 March - "The Bomb" debuted on BBC1.
 * Century 21 Records released a Doctor Who edition of its 21 Minutes of Adventure LP record series, featuring the audio soundtrack of "The Planet of Decision", a chapter of The Chase. It was the first spoken word Doctor Who product to market.
 * 2 April - "The Celestial Toyroom" debuted on BBC1.
 * 9 April - "The Hall of Dolls" debuted on BBC1. On the same day, TV Comic released the final part of Plague of the Black Scorpi.
 * 16 April - "The Dancing Floor" debuted on BBC1.
 * 23 April - "The Final Test" debuted on BBC1.
 * 30 April - "A Holiday for the Doctor" debuted on BBC1.
 * 7 May - "Don't Shoot the Pianist" debuted on BBC1.
 * 14 May - "Johnny Ringo" debuted on BBC1.
 * 21 May - "The O. K. Corral" debuted on BBC1. This was the last Doctor Who episode to have an individual title.
 * 28 May - The Savages Episode 1 debuted on BBC1.
 * 4 June - The Savages Episode 2 debuted on BBC1.
 * 11 June - The Savages Episode 3 debuted on BBC1.
 * 18 June - The Savages Episode 4 debuted on BBC1.
 * 25 June - The War Machines Episode 1 debuted on BBC1.
 * 2 July - The War Machines Episode 2 debuted on BBC1.
 * 9 July - The War Machines Episode 3 debuted on BBC1.
 * 16 July - The War Machines Episode 4 debuted on BBC1, concluding the third season.
 * The film Dr. Who and the Daleks was released to theatres in the United States. It was the first public exhibition of anything related to Doctor Who by Americans, pre-empting transmission of the televised series by the better part of a decade.
 * 5 August - The second feature film, Daleks' Invasion Earth 2150 A.D. was released in the UK.
 * The second Doctor Who Annual was published.
 * 8 September - The Dalek Outer Space Book was first published.
 * 10 September - Season 4 began with the BBC1 debut of The Smugglers Episode 1.
 * 17 September - The Smugglers Episode 2 debuted on BBC1.
 * 24 September - The Smugglers Episode 3 debuted on BBC1.
 * 1 October - The Smugglers Episode 4 debuted on BBC1.
 * 8 October - The Tenth Planet Episode 1 debuted on BBC1.
 * 15 October - The Tenth Planet Episode 2 debuted on BBC1.
 * 22 October - The Tenth Planet Episode 3 debuted on BBC1.
 * 29 October - The Tenth Planet Episode 4 debuted on BBC1.
 * 5 November - The Power of the Daleks Episode One debuted on BBC1.
 * 12 November - The Power of the Daleks Episode Two debuted on BBC1.
 * 19 November - The Power of the Daleks Episode Three debuted on BBC1.
 * 26 November - The Power of the Daleks Episode Four debuted on BBC1.
 * 3 December - The Power of the Daleks Episode Five debuted on BBC1.
 * 10 December - The Power of the Daleks Episode Six debuted on BBC1.
 * 17 December - The Highlanders Episode 1 debuted on BBC1.
 * 24 December - The Highlanders Episode 2 debuted on BBC1.
 * 31 December - The Highlanders Episode 3 debuted on BBC1.

Unknown dates

 * Doctor Who and the Invasion from Space was published by World Distributors. A hardcover novella, this was the first publication of an original long-form text story to feature the First Doctor. (It was presumably published prior to October as it featured the First Doctor.)
 * US comic book publisher Dell Comics issued a single-issue adaptation of the Dr. Who and the Daleks film. This was the first appearance of a Doctor Who-related comic book in the US.