The 63rd World Science Fiction Convention (Worldcon), also known as Interaction, was held on 4–8 August 2005 at the SEC Centre with the attached SEC Armadillo and Moat House Hotel in Glasgow, United Kingdom. Parties took place at the Hilton Hotel.

The organising committee was co-chaired by Colin Harris and Vincent Docherty.

This convention was also the 2005 Eurocon.

Attendance was 4,115, out of 5,202 paid memberships. The members represented 35 different nationalities, of which the largest contingents were from the United States and the United Kingdom.

The World Science Fiction Society administers and presents the Hugo Awards,^[1] the oldest and most noteworthy award for science fiction. Selection of the recipients is by vote of the Worldcon members. Categories include novels and short fiction, artwork, dramatic presentations, and various professional and fandom activities.^[1][2]

Other awards may be presented at Worldcon at the discretion of the individual convention committee. This has often included the national SF awards of the host country, such as the Japanese Seiun Awards as part of Nippon 2007,^[3] and the Prix Aurora Awards as part of Anticipation in 2009. The Astounding Award for Best New Writer and the Sidewise Award, though not sponsored by the Worldcon, are usually presented, as well as the Chesley Awards, the Prometheus Award, and others.^[3][4]

Due to the changes in the World Science Fiction Society rules, which reduced the lead time from three to two years, no Worldcon site selection took place at this convention. The site for the 2007 Worldcon was decided at the 2004 Worldcon in Boston under the old three year lead-time rule. The site selection for the 2008 Worldcon, the first under the new two year lead-time rule, took place at the 2006 Worldcon in Anaheim.

• Hugo Award
• Science fiction
• Speculative fiction
• World Science Fiction Society
• Worldcon