1915

April-May

 * The Doctor was wounded at Gallipoli. (DW: The Sea Devils)

May

 * 7 - The RMS Lusitania was torpedoed by the U-20, an act that helped provoke the United States into entering World War I two years later. One of the people killed onboard was a petty criminal named Eric Charles Vincent. (BFA: The Sirens of Time)

August

 * The Seventh Doctor, Ace and Bernice Summerfield arrived in Haiti. (NA: White Darkness)

Alternative timelines

 * In John Smith's possible future, he married Joan Redfern this year. (NA: Human Nature)
 * In another alternative timeline, the Lusitania did not sink due to the Fifth Doctor's intervention. Vincent, having survived, went on to kill Alexander Fleming in a botched robbery attempt before the biologist discovered penicillin. Without the protection offered by penicillin, Earth fell prey to meningitis and pneumonia in 1956. The survivors never developed a space programme. (BFA: The Sirens of Time)

Unknown dates

 * The Doctor met Harry Houdini. (DW: Planet of the Spiders, DW: Revenge of the Cybermen)

March

 * 21 - Ian Stuart Black, who wrote and novelised three stories for Doctor Who, was born.

May

 * 20 - Peter Copley (Warlock in DW: Pyramids of Mars) was born.

July

 * 20 - Robin Wentworth (Gilbert Horner in DW: The Dæmons) was born.

August

 * 26 - Humphrey Searle, who provided incidental music for DW: The Myth Makers, was born.

September

 * 13 - Alan Bromly, director of DW: The Time Warrior and DW: Nightmare of Eden, was born.
 * 17 - John Witty, the voice of the Computer in DW: The Seeds of Death, was born in Bristol.
 * 22 - Emrys Jones (Master of the Land in DW: The Mind Robber) was born.

December

 * 13 - Mary Morris, who played Panna in DW: Kinda, was born.
 * 19 - Lewis Greifer was born.
 * 21 - James Cairncross, who played Lemaitre in DW: The Reign of Terror and Beta in DW: The Krotons, was born in Dunfermline, Fife, Scotland.