1966 (releases)

January

 * Dr Who on the Planet Zactus Painting Book was published by World Distributors.
 * Travels in Time Painting Book was published by World Distributors.
 * Doctor Who and the Invasion from Space was published by World Distributors.
 * Doctor Who en de Daleks, the Dutch translation of Doctor Who in an Exciting Adventure with the Daleks, was first published by Uitgeversmij.
 * 1 January - "Volcano" debuted on BBC1.
 * 8 January - "Golden Death" debuted on BBC1.
 * 8 January - The final part of the TV Century 21 story Eve of War was released.
 * 15 January - "Escape Switch" debuted on BBC1 as the 100th episode released.
 * 15 January - TV Comic released the final part of comic story A Christmas Story.
 * 15 January - The first part of COMIC: The Archives of Phryne 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", the twelfth and final episode of The Daleks' Master Plan, debuted on BBC1.

February

 * 3 February - The Dalek Party was first broadcast on an episode of Blue Peter.
 * 5 February - "War of God" debuted on BBC1.
 * 6 February - The last part of COMIC: The Archives of Phryne was released.
 * 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", the last episode of The Massacre, debuted on BBC1.

March

 * Dalek Action Paint 'n Puzzle was published by Souvenir Press.
 * Dr. Who Travels in Space Sticker Fun Book was published by World Distributors.
 * Dr. Who Travels in Time Sticker Fun Book was published by World Distributors.
 * Travels in Space Painting Book was published by World Distributors.
 * 5 March - "The Steel Sky", the first episode of The Ark, debuted on BBC1.
 * 5 March - The first part of COMIC: The Rogue Planet was released.
 * 12 March - "The Plague" debuted on BBC1.
 * 12 March - The final part of COMIC: Space Station Z-7 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.
 * 26 March - The last part of COMIC: The Rogue Planet was released.

April

 * Century 21 Records released a Doctor Who edition of its 21 Minutes of Adventure LP record series. A record named The Daleks featured 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.
 * 2 April - The first part of COMIC: Impasse was released.
 * 9 April - "The Hall of Dolls" debuted on BBC1.
 * 9 April - The final part of COMIC: Plague of the Black Scorpi was released.
 * 16 April - "The Dancing Floor" debuted on BBC1.
 * 16 April - The first part of COMIC: The Trodos Tyranny was released.
 * 23 April - "The Final Test" debuted on BBC1.
 * 30 April - "A Holiday for the Doctor" debuted on BBC1.

May

 * May - The activity books Puzzle Fun No. 1 and Puzzle Fun No. 2 were published by World Distributors.
 * 7 May - "Don't Shoot the Pianist" debuted on BBC1.
 * 14 May - "Johnny Ringo" debuted on BBC1.
 * 14 May - The final part of COMIC: The Trodos Tyranny was released.
 * 14 May - - The final part of COMIC: Impasse was released.
 * 21 May - "The O. K. Corral" debuted on BBC1.
 * 21 May - The first part of COMIC: The Terrorkon Harvest was released.
 * 21 May - The first part of COMIC: The Secret of Gemino was released.

June

 * 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.
 * 18 June - The final part of COMIC: The Secret of Gemino was released.
 * 25 June - The War Machines Episode 1 debuted on BBC1.
 * 25 June - The first part of COMIC: The Haunted Planet was released.
 * 25 June - The last part of COMIC: The Terrorkon Harvest was released.

July

 * July - The film Dr. Who and the Daleks was released to theatres in the United States.
 * 2 July - The War Machines Episode 2 debuted on BBC1.
 * 2 July - The first part of COMIC: Legacy of Yesteryear was released.
 * 9 July - The War Machines Episode 3 debuted on BBC1.
 * 16 July - The War Machines Episode 4 debuted on BBC1, concluding the third season.
 * 23 July - The fifth and final part of COMIC: The Haunted Planet was released.
 * 26 July - Daleks' Invasion Earth 2150 A.D. premiered.
 * 30 July - The first part of COMIC: The Hunters of Zerox was released.

August

 * 5 August - The second feature film, Daleks' Invasion Earth 2150 A.D., was released in the UK.
 * 27 August - The fifth and final part of COMIC: The Hunters of Zerox was released.

September

 * September - The second Doctor Who Annual was published.
 * 3 September - The first part of COMIC: The Underwater Robot was released.
 * 3 September - The last part of COMIC: Legacy of Yesteryear was released.
 * 8 September - The Dalek Outer Space Book was published by Souvenir Press and Panther Books.
 * 10 September - Season 4 began with the BBC1 debut of The Smugglers Episode 1.
 * 10 September - The first part of COMIC: Shadow of Humanity was released.
 * 17 September - The Smugglers Episode 2 debuted on BBC1.
 * 24 September - The Smugglers Episode 3 debuted on BBC1. On the same day, TV Comics released the fourth and final part of COMIC: The Underwater Robot.

October

 * 1 October - The Smugglers Episode 4 debuted on BBC1. On the same day, TV Comics released the first part of COMIC: Return of the Trods.
 * 1 October - The last part of COMIC: Shadow of Humanity was released.
 * 8 October - The Tenth Planet Episode 1 debuted on BBC1.
 * 8 October - The first part of COMIC: The Emissaries of Jevo was released.
 * 15 October - The Tenth Planet Episode 2 debuted on BBC1.
 * 22 October - The Tenth Planet Episode 3 debuted on BBC1. On the same day, TV Comics released the fourth and final part of COMIC: Return of the Trods.
 * 29 October - The Tenth Planet Episode 4 debuted on BBC1. On the same day, TV Comics released the first part of COMIC: The Galaxy Games.

November

 * 5 November - The Power of the Daleks Episode 1 debuted on BBC1.
 * 12 November - The Power of the Daleks Episode 2 debuted on BBC1.
 * 12 November - The last part of COMIC: The Emissaries of Jevo was released.
 * 19 November - The Power of the Daleks Episode 3 debuted on BBC1. On the same day, TV Comics released the fourth and final part of COMIC: The Galaxy Games.
 * 19 November - The first part of COMIC: The Road to Conflict was released.
 * 26 November - The Power of the Daleks Episode 4 debuted on BBC1. On the same day, TV Comics released the first part of COMIC: The Experimenters.

December

 * December - US comic book publisher Dell Comics issued Dr. Who and the Daleks, a single-issue adaptation of the film of the same name.
 * 3 December - The Power of the Daleks Episode 5 debuted on BBC1.
 * 10 December - The Power of the Daleks Episode 6 debuted on BBC1.
 * 17 December - The Highlanders Episode 1 debuted on BBC1. On the same day, TV Comics released the fourth and final part of COMIC: The Experimenters.
 * 24 December - The Highlanders Episode 2 debuted on BBC1.
 * 24 December - The first part of COMIC: The Extortioner was released.
 * 31 December - The Highlanders Episode 3 debuted on BBC1.

Unknown dates

 * The TV Comic Annual 1966 containing Prisoners of the Kleptons and The Caterpillar Men was released.
 * The TV Comic Holiday Special 1966 containing Guests of King Neptune and The Gaze of the Gorgon was released.