1970 (production)

January

 * 5 and 12 January - Studio filming for Doctor Who and the Silurians took place at BBC Television Centre 1. (REF: Doctor Who The Handbook: The Third Doctor)
 * 9 January - Full scripts were requested from Don Houghton for The Mole-Bore, later renamed Inferno.
 * 19 and 26 January - Studio filming for Doctor Who and the Silurians took place at BBC Television Centre 8. (REF: Doctor Who The Handbook: The Third Doctor)
 * 23, 26-27 and 29-31 January - Location filming for The Ambassadors of Death took place. (REF: Doctor Who The Handbook: The Third Doctor)

February

 * 2-4 February - Location filming for The Ambassadors of Death took place. (REF: Doctor Who The Handbook: The Third Doctor)
 * 13, 20 and 27 February - Studio filming for The Ambassadors of Death took place at BBC Television Centre 3. (REF: Doctor Who The Handbook: The Third Doctor)
 * 23 February - John Levene was hired to return as UNIT corporal John Benton in The Mole-Bore (later Inferno), now more of a regular in the series and promoted to a sergeant.
 * 27 February - The BBC's Audience Research Dept. filed an Audience Research Report on Spearhead from Space Episode 1. The episode rated a Reaction Index of 54, with new Doctor Jon Pertwee having been "accepted without question".

March

 * 6 and 13 March - Studio filming for The Ambassadors of Death took place at BBC Television Centre 3. (REF: Doctor Who The Handbook: The Third Doctor)
 * 20 March - Studio filming for The Ambassadors of Death took place at BBC Television Centre 4. (REF: Doctor Who The Handbook: The Third Doctor)
 * 27 March - Studio filming for The Ambassadors of Death took place at BBC Television Centre 1. (REF: Doctor Who The Handbook: The Third Doctor)
 * 31 March - Location filming for Inferno took place (REF: Doctor Who The Handbook: The Third Doctor)

April

 * 1-3 April - Location filming for Inferno took place (REF: Doctor Who The Handbook: The Third Doctor)
 * 6-8 April - Pre-filming for Inferno took place on Stage 2 of Ealing Studios. (REF: Doctor Who The Handbook: The Third Doctor)
 * 8 April - Nicholas Courtney signed on for another season as Brigadier Lethbridge-Stewart.
 * 23 and 24 April - Studio filming for Inferno took place at BBC Television Centre 3. (REF: Doctor Who The Handbook: The Third Doctor)

May

 * 6-8 May - Studio filming for Inferno took place at BBC Television Centre 3. (REF: Doctor Who The Handbook: The Third Doctor)
 * 21-22 May - Studio filming for Inferno took place at BBC Television Centre 6. (REF: Doctor Who The Handbook: The Third Doctor)
 * 29 May - Studio filming for Inferno took place at BBC Television Centre 3. (REF: Doctor Who The Handbook: The Third Doctor)

September

 * 18-19 and 21-23 September - Location filming for Terror of the Autons took place. (REF: Doctor Who The Handbook: The Third Doctor)

October

 * 5 October - In the US, the National Educational Television network was rebranded and relaunched as the Public Broadcasting Service (PBS). This loose affiliation of broadcasters introduced countless UK-produced television programs to North American audiences over the next four decades. It became the primary broadcast home of the 1963-89 version of Doctor Who beginning in the late 1970s.
 * 9-10 October - Studio filming for Terror of the Autons took place at BBC Television Centre 8. (REF: Doctor Who The Handbook: The Third Doctor)
 * 12 October - R/T voices for The Mind of Evil was recorded. (REF: Doctor Who The Handbook: The Third Doctor)
 * 23-24 October - Studio filming for Terror of the Autons took place at BBC Television Centre 6. (REF: Doctor Who The Handbook: The Third Doctor)
 * 26-30 October - Location filming for The Mind of Evil took place. (REF: Doctor Who The Handbook: The Third Doctor)
 * 27 October - Script editor Terrance Dicks wrote to writer Louis Marks about Marks' story idea for Day of the Daleks, "the addition of the 'going into the future' storyline gives it the added science fiction feeling that we need." He however explained that he had not yet been given to all-clear to commission another season, and thus could not yet commission his storyline. He finally gave the order on 22 January 1971.
 * 31 October - Location filming for The Mind of Evil was remounted. (REF: Doctor Who The Handbook: The Third Doctor)

November

 * 20-21 November - Studio filming for The Mind of Evil took place at BBC Television Centre 3. (REF: Doctor Who The Handbook: The Third Doctor)

December

 * 4-5 December - Studio filming for The Mind of Evil took place at BBC Television Centre 6. (REF: Doctor Who The Handbook: The Third Doctor)
 * 18-19 December - Studio filming for The Mind of Evil took place at BBC Television Centre 3. (REF: Doctor Who The Handbook: The Third Doctor)