The 23rd World Science Fiction Convention (Worldcon), also known as Loncon II, was held on 27–30 August 1965 at the Mount Royal Hotel in London, United Kingdom.

[1] It was the second Worldcon to be held in London, following the original Loncon in 1957.

[3] The World Science Fiction Society administers and presents the Hugo Awards,[4] the oldest and most noteworthy award for science fiction.

Categories include novels and short fiction, artwork, dramatic presentations, and various professional and fandom activities.

[4][5] Other awards may be presented at Worldcon at the discretion of the individual convention committee.