The first Worldcon to be held outside the US was the sixth , in 1948 in Toronto , Ontario , Canada , and the first outside North America was the 15th World Science Fiction Convention , in 1957 in Bayswater , London . The 2007 Worldcon in Yokohama , Japan , was the first to be held in Asia . Other non-US Worldcons held in the 21st century have included the 2003 Worldcon in Toronto , Ontario , Canada , the 2005 Worldcon , held in Glasgow , Scotland ; the 2009 Worldcon , in Montreal , Quebec , Canada ; the 2010 Worldcon , in Melbourne , Australia ; the 2014 Worldcon , in London , United Kingdom and the 2017 Worldcon , in Helsinki , Finland
2009 Worldcon
67th World Science Fiction Convention
Worldcon