2004 (releases)

January

 * 5 January - Sometime Never... was first published.
 * 7 January - The Two Doctors was released to DVD in Region 4 in the Australian market.
 * 8 January - DWM 339 was released.
 * 15 January - Short Trips: Steel Skies was first published.
 * 19 January - The Visitation was released to DVD in Region 2 in the UK.
 * 20 January - AUDIO: The Creed of the Kromon was first released.

February

 * February - AUDIO: Death and the Daleks was first released.
 * February - AUDIO: A Labyrinth of Histories was first released.
 * 2 February - Scream of the Shalka, the novelisation of WC: Scream of the Shalka webcast, was published.
 * 2 February - Fury from the Deep was released by BBC Audio.
 * 4 February - DWM 340 was released.
 * 7 February - The Curse of Fenric was released to DVD in Region 4.
 * 19 February - The novella Blood and Hope was first published by Telos Publishing.

March

 * March - AUDIO: Weapon of Choice was first released.
 * 1 March - Pyramids of Mars was released to DVD in the UK.
 * 1 March - Empire of Death was first published.
 * 2 March - The Seeds of Death and The Three Doctors were released to DVD in Region 1.
 * 2 March - AUDIO: The Natural History of Fear was first released.
 * 4 March - DWM 341 was released.
 * 11 March - AUDIO: The Twilight Kingdom was first released.
 * 18 March - The novella The Dalek Factor was first published by Telos Publishing.

April

 * April - AUDIO: The Axis of Insanity was first released.
 * April - AUDIO: Square One and AUDIO: The Inquiry were first released.
 * April - PROSE: Of the City of the Saved... was first published, featuring PROSE: Prologue to Warlords of Utopia.
 * 1 April - DWM 342 was released.
 * 3 April - The Feast of the Stone was released online.
 * 5 April - Halflife was first published.
 * 7 April - The Iron Legion graphic novel was first published.
 * 8 April - The Visitation was released to DVD in Region 4.
 * 8 April - The Audio Scripts: Volume Three was released by Big Finish.
 * 9 April - Short Trips: Past Tense was first published.
 * 28 April - DWM 343 was released.
 * 28 April - PROSE: The Tunnel at the End of the Light.

May

 * May - AUDIO: Arrangements for War was first released.
 * May - AUDIO: A Blind Eye was first released.
 * May - AUDIO: Dalek Empire III: The Exterminators was first released.
 * May - The Big Hunt was first published.
 * 3 May - The BBC Past Doctor Adventures novel The Eleventh Tiger was first published.
 * 3 May - The Wheel in Space was released by BBC Audio.
 * 10 May - The Green Death was released on DVD in region 2 in the UK.
 * 27 May - DWM 344 was released.

June

 * 1 June - The Curse of Fenric and The Two Doctors were released to DVD in Region 1.
 * 7 June - The Tomorrow Windows was first published.
 * 10 June - Pyramids of Mars was released to DVD in Region 4.
 * 14 June - PROSE: The Clockwork Woman.
 * 24 June - DWM 345 was released.
 * 26 June - The Web of Fear episode one was repeated on BBC Four as part of a night dedicated to cult TV from the 1960s.
 * 26 June - AUDIO: The Harvest was first released.
 * 26 June - Short Trips: Life Science was first published.
 * 29 June - AUDIO: Dalek Empire III: The Healers was first released.

July

 * July - PROSE: A Life Worth Living was first published.
 * July - Dalek Empire III: The Survivors and The Roof of the World were first released.
 * July - Dalek Empire: The Scripts was released by Big Finish.
 * 5 July - The Leisure Hive was released to DVD in the UK.
 * 7 July - AUDIO: The Grel Escape
 * 19 July - Synthespians™ was first published.
 * 19 July - Tales from the TARDIS: Volume One and Tales from the TARDIS: Volume Two were first released.
 * 22 July - DWM 346 was released.

August

 * August - AUDIO: Medicinal Purposes was first released.
 * August - AUDIO: Dalek Empire III: The Demons was first released.
 * 2 August - The Sleep of Reason was first published.
 * 2 August - The Power of the Daleks and The Evil of the Daleks were re-released by BBC Audio.
 * 5 August - The Green Death was released to DVD in Region 4.
 * 19 August - DWM 347 was released.
 * 26 August - Short Trips: Repercussions was first published by Big Finish Productions.

September

 * September - AUDIO: Faith Stealer was first released.
 * September - AUDIO: Dalek Empire III: The Warriors was first released.
 * September - PROSE: Kitsune was published.
 * 6 September - AUDIO: Doctor Who at the BBC Volume 2 was first released.
 * 6 September - The Algebra of Ice was first published.
 * 10 September - AUDIO: The Bone of Contention was first released.
 * 16 September - DWM 348 was released.
 * 20 September - Ghost Light was released to DVD in the UK.
 * 30 September - Short Trips: Monsters was first published.

October

 * October - REF: Howe's Transcendental Toybox Update No. 1 was first published.
 * October - AUDIO: Dalek Empire III: The Future was first released.
 * 4 October - The Deadstone Memorial was first published.
 * 7 October - The Leisure Hive was released to DVD in Region 4.
 * 14 October - DWM 349 was released.
 * 18 October - AUDIO: The Last was first released.

November

 * November - AUDIO: Caerdroia was first released.
 * November - REF: The Discontinuity Guide, 2nd edition, was first published.
 * November - AUDIO: The Relics of Jegg-Sau was first released.
 * November - PROSE: Dead Romance was republished, featuring PROSE: Toy Story, The Cosmology of the Spiral Politic and Grass.
 * November - PROSE: Warlords of Utopia was first published, featuring PROSE: Prologue to Warring States.
 * 1 November - Lost in Time, a DVD box set spotlighting incomplete stories from the William Hartnell and Patrick Troughton eras, was released in the UK.
 * 1 November - The Indestructible Man was first published.
 * 1 November - The audio box set Cybermen was released by BBC Audio, containing audio recordings of The Tenth Planet and The Invasion.
 * 2 November - The Lost in Time DVD collection was issued in Region 1.
 * 7 November - Earthshock and Pyramids of Mars were released to DVD in Region 1.
 * 10 November - The Nuclear Option was made available for free on the Big Finish website two weeks before the rest of Short Trips: 2040 was released.
 * 11 November - DWM 350 was released.
 * 26 November - Short Trips: 2040 was first published.

December

 * December - AUDIO: The Next Life was first released.
 * December - AUDIO: Her Final Flight was first released.
 * December - PROSE: A Life in Pieces was first published.
 * December - AUDIO: Time Heals was first released.
 * December - AUDIO: Storm Mine was first released.
 * 2 December - The Severed Man was first published.
 * 2 December - The Lost in Time DVD box set was released in Region 4.
 * 9 December - AUDIO: Silver Lining, a single-episode Benny Summerfield story, and AUDIO: The Coup, a "prologue" release for the upcoming UNIT audio series, were released on an exclusive CD included with DWM 351.
 * 14 December -  Ships That Pass was made available for free on the Big Finish website two weeks before the rest of Short Trips: A Christmas Treasury was published.
 * 20 December - Radiophon-A-Tron was launched online on the Doctor Who website.
 * 30 December - The anthology Short Trips: A Christmas Treasury was first published by Big Finish.

Unknown dates

 * HOMEVID: Dæmos Rising was first released.
 * AUDIO:  The Prisoner, a twenty-minute short play, was included on the CD release Paul Darrow: The Actor Speaks.
 * NOTVALID: The Feast of the Stone was published to the BBC website.