1976

Dates Unknown

 * In San Francisco, Carolyn McConnell meets the Doctor and Sam Jones, who are hunting vampires. (EDA: Vampire Science)

January

 * 12 - Agatha Christie died. (DW: The Unicorn and the Wasp)

Summer

 * The Vardans attempted an invasion of Earth with Mortimus' assistance. (NA: No Future)
 * A meteorite landed in New York City's Central Park, temporarily giving Alice Trefusis super-powers. (AG: Starfall)

Late summer or early autumn

 * Brigadier Alistair Gordon Lethbridge-Stewart retired from UNIT and became a teacher at Brendon Public School. (DW: Mawdryn Undead)

January

 * 3 - DW: The Brain of Morbius Part 1 was first broadcast.
 * 10 - DW: The Brain of Morbius Part 2 was first broadcast.
 * 15 - DWN: Doctor Who and the Loch Ness Monster was first published.
 * 17 - DW: The Brain of Morbius Part 3 was first broadcast.
 * 24 - DW: The Brain of Morbius Part 4 was first broadcast.
 * 31 - DW: The Seeds of Doom Part 1 was first broadcast. This was the last serial to feature UNIT in a major way until 1989's DW: Battlefield.

February

 * 7 - DW: The Seeds of Doom Part 2 was first broadcast.
 * 14 - DW: The Seeds of Doom Part 3 was first broadcast.
 * 19 - DWN: Doctor Who and the Dinosaur Invasion and DWN: Doctor Who and the Tenth Planet were first published, the latter being the first Target Books-commissioned novelisation of a solo First Doctor story (the initial three published in 1973 were in fact reprints of novels first published in the mid-1960s).
 * 21 - DW: The Seeds of Doom Part 4 was first broadcast.
 * 28 - DW: The Seeds of Doom Part 5 was first broadcast.

March

 * Campbell Singer, who played the King of Hearts, Sgt. Rugg, and Joey the Clown in DW: The Celestial Toymaker died.
 * 6 - DW: The Seeds of Doom Part 6 was first broadcast, ending Season 13.
 * 18 - DWN: Doctor Who and the Ice Warriors was first published.

May

 * 20 - DWN: Doctor Who - The Revenge of the Cybermen was first published.

July

 * 19 - Benedict Cumberbatch born.
 * 22 - DWN: Doctor Who and the Genesis of the Daleks was first published.

August

 * 6 - William Mervyn (Sir Charles Summer in DW: The War Machines), died in London.
 * 19 - DWN: Doctor Who and the Web of Fear was first published.

September

 * Doctor Who Annual 1977 was published.
 * Terry Nation's Dalek Annual 1977 was published.
 * Doctor Who and the Daleks Omnibus was published.
 * 4 - DW: The Masque of Mandragora Part 1 was first broadcast, starting Season 14.
 * 11 - DW: The Masque of Mandragora Part 2 was first broadcast.
 * 18 - DW: The Masque of Mandragora Part 3 was first broadcast.
 * 23 - DWN: Doctor Who and the Space War was first published. This adaptation of DW: Frontier in Space was the last Target Books novelisation to use a title significantly different from that of the source material (other than the practice of adding Doctor Who and... to the titles, which remained in place for several more years, and the occasional spelling deviation).
 * 25 - DW: The Masque of Mandragora Part 4 was first broadcast.

October

 * 2 - DW: The Hand of Fear Part 1 was first broadcast.
 * 4 - BBCR: A special radio story featuring Tom Baker and Elisabeth Sladen was broadcast by BBC Radio as part of its Exploration Earth series. This was the first made-for-radio Doctor Who adventure and the last of its kind until BBCR: Slipback in 1986.
 * 9 - DW: The Hand of Fear Part 2 was first broadcast.
 * 16 - DW: The Hand of Fear Part 3 was first broadcast.
 * 21 - DWN: Doctor Who and the Planet of the Daleks was first published. Although not widely recognized as such, the original serials DW: Frontier in Space and DW: Planet of the Daleks formed one story arc. As such, by Target Books publishing the adaptation of Frontier (as DWN: Doctor Who and the Space War) in September, followed by part 2 this month, these two books actually predate the two-volume novelisation of DW: The Daleks' Master Plan (widely considered the first occurrence of this).
 * 22 - The New Avengers debuts on UK television. This was a revival of the series The Avengers created by Sydney Newman, and predates both Star Trek: The Next Generation and Doctor Who as one of the first revivals of a "genre" TV series.
 * 23 - DW: The Hand of Fear Part 4 was first broadcast. Elisabeth Sladen left the series with this Part, she returned to the series 30 years later in 2006's School Reunion.
 * 30 - DW: The Deadly Assassin Part 1 was first broadcast. The Master returns; this story was also the first (and to date, only) televised serial in which the Doctor does not share an adventure with a companion, or even a companion figure.

November

 * 6 - DW: The Deadly Assassin Part 2 was first broadcast.
 * 13 - DW: The Deadly Assassin Part 3 was first broadcast.
 * 20 - DW: The Deadly Assassin Part 4 was first broadcast. Following this Part, Doctor Who took a mid-season break that lasts 6 weeks (returning on 1st January 1977). This was the first time a season of Doctor Who has been divided in such a fashion, the next time a mid-season break like this was repeated was in 2011 with Series 6 of the BBC Wales produced series of Doctor Who.

December

 * 16 - DWN: Doctor Who and the Pyramids of Mars was first published.
 * The second edition of REF: The Making of Doctor Who was published by Target Books; this was a revised version of an earlier book first released by another company, Piccolo Books, in 1972, but updated to include the Fourth Doctor.
 * The Doctor Who Dinosaur Book was first published.
 * 31 - The Daily Mirror published an exclusive short story, Doctor Who and the Hell Planet; this was the first original Doctor Who short story to be published in a newspaper, or outside of an Annual. The next original newspaper-exclusive short story wouldn't be published for another 30 years.

Unknown

 * Doctor Who and the Pescatons was released on LP by Argo Records. Discounting educational programmes, this was the first original audio drama based upon the franchise, predating the releases of Big Finish Productions by decades.