2019 - The Calculating Stars by Mary Robinette Kowal
2018 - The Stone Sky by N.K. Jemisin
2017 - The Obelisk Gate by N.K. Jemisin
2016 - The Fifth Season by N.K. Jemison
2015 - The Three-Body Problem, Cixin Liu
2014 - Ancillary Justice, Ann Leckie
2013 - Reshirts: A Novel With Three Cadas, John Scalzi
2012 - Among Others, Jo Walton
2011 - Blackout/All Clear, Connie Willis
2010 - The City & The City, China Miéville
- The Windup Girl, Paolo Bacigalupi
2009 - The Graveyard Book by Neil Gaiman
2008 - The Yiddish Policemen’s Union by Michael Chabon
2007 - Rainbows End by Vernor Vinge
2006 - Spin by Robert Charles Wilson
2005 - Jonathan Strange & Mr. Norrell by Susanna Clarke
2004 - Paladin of Souls by Lois McMaster Bujold
2003 - Hominids by Robert J. Sawyer
2002 - American Gods by Neil Gaiman
2001 - Harry Potter and the Goblet of Fire by J. K. Rowling
2000 - A Deepness in the Sky by Vernor Vinge
1999 - To Say Nothing of the Dog by Connie Willis
1998 - Forever Peace by Joe Haldeman
1997 - Blue Mars by Kim Stanley Robinson
1996 - The Diamond Age by Neal Stephenson
1995 - Mirror Dance by Lois McMaster Bujold
1994 - Green Mars by Kim Stanley Robinson
1993 - A Fire Upon the Deep by Vernor Vinge
- Doomsday Book by Connie Willis
1992 - Barrayar by Lois McMaster Bujold
1991 - The Vor Game by Lois McMaster Bujold
1990 - Hyperion by Dan Simmons
1989 - Cyteen by C. J. Cherryh
1988 - The Uplift War by David Brin
1987 - Speaker for the Dead by Orson Scott Card
1986 - Ender’s Game by Orson Scott Card
1985 - Neuromancer by William Gibson
1984 - Startide Rising by David Brin
1983 - Foundation’s Edge by Isaac Asimov
1982 - Downbelow Station by C. J. Cherryh
1981 - The Snow Queen by Joan D. Vinge
1980 - The Fountains of Paradise by Arthur C. Clarke
1979 - Dreamsnake by Vonda N. McIntyre
1978 - Gateway by Frederik Pohl
1977 - Where Late the Sweet Birds Sang by Kate Wilhelm
1976 - The Forever War by Joe Haldeman
1975 - The Dispossessed by Ursula K. Le Guin
1974 - Rendezvous With Rama by Arthur C. Clarke
1973 - The Gods Themselves by Isaac Asimov
1972 - To Your Scattered Bodies Go by Philip José Farmer
1971 - Ringworld by Larry Niven
1970 - The Left Hand of Darkness by Ursula K. Le Guin
1969 - Stand on Zanzibar by John Brunner
1968 - Lord of Light by Roger Zelazny
1967 - The Moon is a Harsh Mistress by Robert A. Heinlein
1966 - Dune by Frank Herbert
- And Call Me Conrad (alt: This Immortal) by Roger Zelazny