1998 (releases)

January

 * 2 January - PROSE: Tempest was first published.
 * 5 January - PROSE: Kursaal was first published.
 * 5 January - PROSE: The Face of the Enemy was first published.
 * 15 January - DWM 261 was released.

February

 * 1 February - BBC Choice ident was first broadcast on BBC One.
 * 2 February - PROSE: Option Lock was first published.
 * 2 February - PROSE: Eye of Heaven was first published.
 * 3 February - PROSE: Walking to Babylon was first published.
 * 12 February - DWM 262 was released.
 * 14 February - The Red Dwarf special was first broadcast on BBC Two.

March

 * 2 March - PROSE: Longest Day was first published.
 * 2 March - PROSE: The Witch Hunters was first published.
 * 2 March - PROSE: Oblivion was first published.
 * 3 March - PROSE: Short Trips was first published.
 * 12 March - DWM 263 was released.

April

 * 2 April - PROSE: The Medusa Effect was first published.
 * 6 April - PROSE: Legacy of the Daleks was first published.
 * 6 April - PROSE: The Hollow Men was first published.
 * 6 April - DWM 264 was released.

May

 * Unknown - BBV Productions' Audio Adventures in Time & Space range launches with the first three episodes of the Time Travellers series being first published.
 * 3 May - PROSE: Dry Pilgrimage was first published.
 * 4 May - PROSE: Dreamstone Moon was first published.
 * 4 May - PROSE: Catastrophea was first published.
 * 7 May - DWM 265 was released.

June

 * 1 June - PROSE: Seeing I was first published.
 * 1 June - PROSE:  Impractical was first published.
 * 2 June - PROSE: The Sword of Forever was first published.
 * 4 June - DWM 266 was released.

July

 * 2 July - DWM 267 was released.
 * 6 July - PROSE: Placebo Effect was first published.
 * 6 July - PROSE: Zeta Major was first published.
 * 30 July - DWM 268 was released.

August

 * 3 August - PROSE: Vanderdeken's Children was first published.
 * 3 August - PROSE: Dreams of Empire was first published.
 * 20 August - PROSE: Another Girl, Another Planet was first published.
 * 27 August - DWM 269 was released.

September

 * September - AUDIO: Oh No it Isn't, a dramatised audio adaptation of the 1997 novel of the same title, was released.
 * September - AUDIO: Beyond the Sun, a dramatised audio adaptation of the 1997 novel of the same title, was released by Big Finish.
 * 7 September - PROSE: The Scarlet Empress was first published.
 * 7 September - PROSE: Last Man Running was first published.
 * 24 September - DWM 270 was released.

October

 * 5 October - PROSE: The Janus Conjunction was first published.
 * 5 October - PROSE: Matrix was first published.
 * 5 October - REF: Doctor Who: The Television Companion was first published.
 * 6 October - Tom Baker's autobiography, REF: Who on Earth was Tom Baker?, was published in paperback.
 * 15 October - PROSE: Beige Planet Mars was first published.
 * 22 October - DWM 271 was released.

November

 * 16 November - PROSE: Beltempest was first published.
 * 16 November - PROSE: The Infinity Doctors was first published.
 * 16 November - REF: Doctor Who From A to Z was first published.
 * 19 November - REF: Five Rounds Rapid! was first published.
 * 19 November - REF: Doctor Who - The Handbook: The Seventh Doctor was first published.
 * 19 November - DWM 272 was released.

December

 * 2 December - PROSE: Where Angels Fear was first published.
 * 17 December - DWM 273 was released.
 * 28 December - Nightmare of Eden was released on VHS.

Unknown dates

 * Unknown - HOMEVID: Auton 2: Sentinel was released by BBV Productions.