1972

May

 * 25 - Joseph Serf was born in Dayton, Ohio. (SJA: The Man Who Never Was)

Unknown dates

 * Oskar Steinmann died. (NA: Just War)
 * Noel Coward died, an event of which he knew the date due to his status as a time traveller. (EDA: Mad Dogs and Englishmen)
 * The Alliance of Shades was disbanded. (DW: Dreamland)

January

 * 01 - DW: Day of the Daleks Episode 1 was first broadcast, launching Season 9, and marking the first major appearance of the Daleks since DW: The Evil of the Daleks in 1967.
 * 08 - DW: Day of the Daleks Episode 2 was first broadcast.
 * 15 - DW: Day of the Daleks Episode 3 was first broadcast.
 * 22 - DW: Day of the Daleks Episode 4 was first broadcast.
 * 25 - An up-and-coming actor named Tom Baker made his American TV debut with an appearance on The Tonight Show with Johnny Carson, promoting his film Nicholas and Alexandra. In retrospect, this was the first known appearance of any Doctor actor on a major American TV programme (discounting appearances on UK-produced shows like The Avengers and Danger Man that aired in the US).
 * 29 - DW: The Curse of Peladon Episode 1 was first broadcast. A notable member of the cast was David Troughton, son of Second Doctor actor Patrick Troughton; the younger Troughton would continue his involvement in the franchise into the 21st century.

February

 * 05 - DW: The Curse of Peladon Episode 2 was first broadcast.
 * 12 - DW: The Curse of Peladon Episode 3 was first broadcast.
 * 19 - DW: The Curse of Peladon Episode 4 was first broadcast.
 * 26 - DW: The Sea Devils Episode 1 was first broadcast.

March

 * 04 - DW: The Sea Devils Episode 2 was first broadcast.
 * 11 - DW: The Sea Devils Episode 3 was first broadcast.
 * 18 - DW: The Sea Devils Episode 4 was first broadcast.
 * 25 - DW: The Sea Devils Episode 5 was first broadcast.

April

 * 01 - DW: The Sea Devils Episode 6 was first broadcast.
 * 08 - DW: The Mutants Episode 1 was first broadcast.
 * 15 - DW: The Mutants Episode 2 was first broadcast.
 * 20 - The first edition of REF: The Making of Doctor Who was first published by Piccolo Books. Written by Terrance Dicks and Malcolm Hulke, this was the first nonfiction work about the series, and predated Dicks' and Hulke's later contributions to the Target Books line. The book was later published in a revised edition by Target in 1976.
 * 22 - DW: The Mutants Episode 3 was first broadcast.
 * 29 - DW: The Mutants Episode 4 was first broadcast.

May

 * 06 - DW: The Mutants Episode 5 was first broadcast.
 * 13 - DW: The Mutants Episode 6 was first broadcast.
 * 20 - DW: The Time Monster Episode 1 was first broadcast.
 * 27 - DW: The Time Monster Episode 2 was first broadcast.

June

 * 03 - DW: The Time Monster Episode 3 was first broadcast.
 * 10 - DW: The Time Monster Episode 4 was first broadcast.
 * 17 - DW: The Time Monster Episode 5 was first broadcast.
 * 24 - DW: The Time Monster Episode 6 was first broadcast, concluding the 9th season.

September

 * After missing the 1972 edition, World Distributors published Doctor Who Annual 1973. Beginning this year each book included the year in the title (always the year after publication).

October

 * 04 - Colin Gordon, who played the Commandant in DW: The Faceless Ones, died in Haslemere.
 * 22 - Jack Melford, who played King Menelaus in DW: The Myth Makers, died in Poole, England.

December

 * "Who is the Doctor?", a rock version of the Doctor Who theme with spoken lyrics performed by Jon Pertwee, was first released on Purple Records in the UK.
 * 30 - DW: The Three Doctors Episode 1 was first broadcast, launching Doctor Who's 10th season. Patrick Troughton as the Second Doctor and (in a much-reduced role due to ill-health) William Hartnell as the First Doctor returned for this story, which celebrated the tenth anniversary of Doctor Who.

Unknown dates

 * Shaun Dingwall, who played Pete Tyler in Series 1 and 2 of the revived Doctor Who, was born in London.