1991 (releases)

January

 * 24 January - DWM 170 was released.

February

 * 21 February - DWM 171 was released.

March

 * 21 March - DWM 172 was released.

April

 * April - Spearhead from Space was released in the US on VHS.
 * Doctor Who - Variations on a Theme was reissued on CD by Silva Screen Records.
 * 18 April - DWM 173 was released.

May

 * 16 May - DWM 174 was released.

June

 * 13 June - DWM 175 was released.
 * 20 June - PROSE: Timewyrm: Genesys was first published.

July

 * July - Doctor Who Magazine Summer Special 1991 was published.
 * 5 July - The Doctor Who exhibition Behind the Sofa opened at MOMI in London.
 * 11 July - DWM 176 was released.
 * 18 July - PROSE: Doctor Who - Battlefield was first published.
 * 25 July - Marvel Comics published the Doctor Who Yearbook.

August

 * 8 August - DWM 177 was released.
 * 15 August - PROSE: Timewyrm: Exodus was first published.
 * 26 August - The original Pilot Episode of Doctor Who debuted on BBC1 on UK television.

September

 * 5 September - DWM 178 was released.
 * 15 September - PROSE: Doctor Who - The Pescatons was first published.

October

 * 3 October - DWM 179 was released.
 * 17 October - PROSE: Timewyrm: Apocalypse was first published.
 * 17 October - REF: The Gallifrey Chronicles was first published.
 * 31 October - DWM 180 was released.

November

 * November - Doctor Who Magazine Winter Special of 1991 was published.
 * 1 November - Who on Earth is Tom Baker was released.
 * 21 November - REF: The Terrestrial Index was first published.
 * 28 November - DWM 181 was released.

December

 * December - REF: Time Lord, a single-volume role-playing game issued by Virgin Publishing, was first published.
 * 1 December - Who on Earth is Tom Baker was released directly to VHS.
 * 5 December - PROSE: Timewyrm: Revelation was first published.
 * 26 December - DWM 182 was released.

Unknown dates

 * Unknown - Silva Screen Records released a soundtrack CD for The Curse of Fenric.