1973 (releases)

January

 * January - The Dr Who Colouring Book was published by World Distributors.
 * 6 January - Episode Two of The Three Doctors debuted on BBC1.
 * 6 January - The sixth part of Zeron Invasion was first published in TV Action & Countdown.
 * 13 January - Episode Three of The Three Doctors debuted on BBC1.
 * 13 January - The seventh and final part of Zeron Invasion was first published in TV Action & Countdown.
 * 20 January - Episode Four of The Three Doctors debuted on BBC1.
 * 20 January - The first part of Deadly Choice was first published in TV Action & Countdown.
 * 27 January - Episode One of Carnival of Monsters debuted on BBC1.
 * 27 January - The second part of Deadly Choice was first published in TV Action, the same publication under a different name.

February

 * 3 February - Episode Two of Carnival of Monsters debuted on BBC1.
 * 3 February - The third and final part of Deadly Choice was first published in TV Action.
 * 10 February - Episode Three of Carnival of Monsters debuted on BBC1.
 * 10 February - The only part of Who is the Stranger was first published in TV Action.
 * 17 February - Episode Four of Carnival of Monsters debuted on BBC1.
 * 24 February - Episode One of Frontier in Space debuted on BBC1.

March

 * 3 March - Episode Two of Frontier in Space debuted on BBC1.
 * 3 March - The first part of The Glen of Sleeping was first published in TV Action.
 * 10 March - Episode Three of Frontier in Space debuted on BBC1.
 * 10 March - The second part of The Glen of Sleeping was first published in TV Action.
 * 17 March - Episode Four of Frontier in Space debuted on BBC1.
 * 17 March - The third part of The Glen of Sleeping was first published in TV Action.
 * 24 March - Episode Five of Frontier in Space debuted on BBC1.
 * 24 March - The fourth part of The Glen of Sleeping was first published in TV Action.
 * 31 March - Episode Six of Frontier in Space debuted on BBC1.
 * 31 March - The fifth and final part of The Glen of Sleeping was first published in TV Action.

April

 * 7 April - Episode One of Planet of the Daleks debuted on BBC1.
 * 7 April - The only part of The Threat from Beneath was first published in TV Action.
 * 14 April - Episode Two of Planet of the Daleks debuted on BBC1.
 * 21 April - Episode Three of Planet of the Daleks debuted on BBC1.
 * 28 April - Episode Four of Planet of the Daleks debuted on BBC1.

May

 * May - The BBC tv Special Effects Exhibition closed.
 * 2 May - Target Books reissued Doctor Who in an Exciting Adventure with the Daleks, Doctor Who and the Crusaders, and Doctor Who and the Zarbi, novelisations of The Daleks, The Crusade and The Web Planet.
 * 5 May - Episode Five of Planet of the Daleks debuted on BBC1.
 * 5 May - The first part of Back to the Sun was first published in TV Action.
 * 12 May - Episode Six of Planet of the Daleks debuted on BBC1.
 * 12 May - The second part of Back to the Sun was first published in TV Action.
 * 19 May - Episode One of The Green Death debuted on BBC1.
 * 19 May - The third part of Back to the Sun was first published in TV Action.
 * 26 May - Episode Two of The Green Death debuted on BBC1.
 * 26 May - The fourth and final part of  Back to the Sun was first published in TV Action.

June

 * 1 June - Doctor Who Holiday Special 1973 was first published in TV Action by Polystyle.
 * 2 June - Episode Three of The Green Death debuted on BBC1.
 * 2 June - The only part of The Labyrinth was first published in TV Action.
 * 7 June - The Dalek Appeal was first broadcast on an episode of Blue Peter.
 * 9 June - Episode Four of The Green Death debuted on BBC1.
 * 16 June - Episode Five of The Green Death debuted on BBC1.
 * 23 June - Episode Six of The Green Death debuted on BBC1.
 * 23 June - The only part of The Spoilers was first published in TV Action.

July

 * 7 July - The first part of The Vortex was first published in TV Action.
 * 14 July - The second part of The Vortex was first published in TV Action.
 * 21 July - The third part of The Vortex was first published in TV Action.
 * 28 July - The fourth part of The Vortex was first published in TV Action.

August

 * 4 August - The fifth and final part of The Vortex was first published in TV Action.
 * 18 August - The only part of The Unheard Voice was first published in TV Action, ending its Doctor Who comic strip.

September

 * The Dance of the Daleks was first broadcast on an episode of Vision On.
 * The Doctor Who Annual 1974 was published.
 * 1 September - The first part of Children of the Evil Eye was first published in TV Comic, resuming the Doctor Who comic strip after several years in another publication.
 * 8 September - The second part of Children of the Evil Eye was first published in TV Comic.
 * 15 September - The third part of Children of the Evil Eye was first published in TV Comic.
 * 22 September - The fourth part of Children of the Evil Eye was first published in TV Comic.
 * 29 September - The fifth part of Children of the Evil Eye was first published in TV Comic.

October

 * 6 October - The sixth and final part of Children of the Evil Eye was first published in TV Comic.
 * 13 October - The first part of Nova was first published in TV Comic.
 * 20 October - The second part of Nova was first published in TV Comic.
 * 27 October - The third part of Nova was first published in TV Comic.

November

 * 3 November - The fourth part of Nova was first published in TV Comic.
 * 10 November - The fifth part of Nova was first published in TV Comic
 * 17 November - The sixth part of Nova was first published in TV Comic.
 * 24 November - The seventh part of Nova was first published in TV Comic.

December

 * 1 December - The eighth part of  Nova  was first published in TV Comic.
 * 8 December - The ninth and final part of Nova was first published in TV Comic.
 * 15 December - Part One of The Time Warrior debuted on BBC1.
 * 15 December - Doctor Who was featured on the cover of the Radio Times.
 * 15 December - The first part of The Amateur was first published in TV Comic.
 * 22 December - Part Two of The Time Warrior debuted on BBC1.
 * 22 December - The second part of The Amateur was first published in TV Comic.
 * 29 December - Part Three of The Time Warrior debuted on BBC1.
 * 29 December - The third part of The Amateur was first published in TV Comic.

Unknown dates

 * The 1973 Countdown Annual, featuring the story Ride to Nowhere, was first released.