Award Prometheus Award

SFWA Grand Master (1997)

Gandalf Award (Grand Master, 1978)

World Science Fiction Convention (Guest of Honor)

SF Hall Of Fame (Living Inductee, 2000)

E.E. Smith Memorial Award for Imaginative Fiction (1982)

World Horror Convention Grand Master Award (2005)

Inkpot Award (2007)

Bram Stoker Award (2000)

Porgie Award (1985)

Pro Finlandia Medal (2022)

Finlandia prize (2001)

James Tiptree Jr. award (2004)

Atorox prize (1986 ∙ 1989 ∙ 1993 ∙ 1994 ∙ 1997 ∙ 2001)

Kemi National Comic Strip Contest (3X ∙ winner)