Winners of the Hugo Award for best non-fiction book. (After 1998, the category was retitled best related book. Awards given in one year are for works released during the previous calendar year. Awards given in one year are for works released during the previous calendar year.
- 1980: The Science Fiction Encyclopedia edited by Peter Nicholls
- 1981: Cosmos by Carl Sagan
- 1982: Danse Macabre by Stephen King
- 1983: Isaac Asimov: The Foundations of Science Fiction by James Gunn
- 1984: Encyclopedia of Science Fiction and Fantasy, vol. III by Donald Tuck
- 1985: Wonder's Child: My Life in Science Fiction by Jack Williamson
- 1986: Science Made Stupid by [[Tom Weller]
- 1987: Trillion Year Spree by [[Brian Aldiss] with David Wingrove
- 1988: Michael Whelan's Works of Wonder by Michael Whelan
- 1989: The Motion of Light in Water by [[Samuel R. Delany
- 1990: The World Beyond the Hill by Alexei and Cory Panshin
- 1991: How to Write Science Fiction and Fantasy by Orson Scott Card
- 1992: The World of Charles Addams by Charles Addams
- 1993: ''A Wealth of Fable: An Informal History of Science Fiction Fandom in the 1950s]] by Harry Warner, Jr
- 1994: The Encyclopedia of Science Fiction, edited by John Clute and Peter Nicholls
- 1995: I, Asimov: A Memoir, by Isaac Asimov
- 1996: Science Fiction: The Illustrated Encyclopedia by John Clute
- 1997: Time & Chance by L. Sprague deCamp
- 1998: The Encyclopedia of Fantasy, edited by John Clute and John Grant
