Events that occurred on 3 October.
 On Earth
- 1896 - William Morris, artist and author who influenced J.R.R. Tolkien, dies.
- 1911 - Voice actor Michael Hordern is born.
- 1937 - J.R.R. Tolkien writes Letter 16.
- 1963 - J.R.R. Tolkien posts a letter to Eileen Elgar.
- 1976 - Oxonmoot 1976 at The Welsh Poney.
- 1979 - The Jackanory episode "Riddles in the Dark" is aired on the BBC.
- 1998 - Voice actor Roddy McDowall dies.
- 2009 - Author Gisbert Kranz dies.
- 2009 - Ring*Con 2009 in Bonn, Germany.
- 2010 - Jubilee for Mithlond, the Gothenburg Tolkien Society of Sweden.
 In Arda
- T.A. 3018:
- Gandalf arrives at Weathertop and marks a stone. At night he is attacked there by the Black Riders. He manages to escape with four Riders behind him.
- Together with Strider the four hobbits travel towards Weathertop. They see flashes from the fight at Weathertop while they leave the Midgewater Marshes.
- Boromir travels towards Rivendell to ask for counsel.