These are all of the science fiction and fantasy books out of the thousands that I've read that I 5 starred on Library Thing. As such the list is not intended as a comprehensive list of the best, and it certainly could be more diverse in various ways, but it is what it is -- SF/F books that I thought at some time in my life (possibly when I was 13) were among the best. They are in alphabetic order by last name of the author.
- Iain M. Banks: The Player of Games, Use of Weapons
- John Bellairs: The Face in the Frost
- James Branch Cabell: The Silver Stallion, Figures of Earth, The High Place
- G. K. Chesterton: The Man Who Was Thursday
- John Crowley: Little, Big , Engine Summer
- Avram Davidson: The Enquiries of Doctor Eszterhazy
- Philip K. Dick: The Man in the High Castle, Martian Time Slip, Deus Irae (with Roger Zelazny), Ubik, The Penultimate Truth, Do Androids Dream of Electric Sheep, Galactic Pot-Healer
- Lord Dunsany: At the Edge of the World, The King of Elfland's Daughter, The Complete Pegana
- William Gibson: The Difference Engine (with Bruce Sterling), Neuromancer
- Alasdair Gray: Lanark
- M. John Harrison: The Course of the Heart
- Aldous Huxley: Brave New World
- Ursula K. Le Guin: The Left Hand of Darkness, A Wizard of Earthsea
- Stanislaw Lem: Solaris, Return From the Stars, The Futurological Congress, Memoirs Found In a Bathtub, The Cyberaid
- H.P. Lovecraft: The Dream-Quest of Unknown Kadath, The Case of Charles Dexter Ward
- China Mieville: The Scar, Iron Council
- Michael Moorcock: The Cornelius Chronicles Vol 1. (collects The Final Programme through The Condition of Muzak)
- Ward Moore: Greener Than You Think
- Jenna Katerin Moran: An Unclean Legacy
- George Orwell: 1984
- Mervyn Peake: Titus Groan, Gormenghast
- Christopher Priest: The Islanders
- Adam Roberts: New Model Army, The This
- Michael Shea: Nifft the Lean
- Norman Spinrad: The Iron Dream
- Olaf Stapledon: Last and First Men, Star Maker
- Bruce Sterling: Schismatrix Plus, Holy Fire, Islands in the Net
- Robert Louis Stevenson: Dr. Jekyll and Mr. Hyde
- Steph Swainston: Above the Snowline
- H.G. Wells: The Invisible Man
- Roger Zelazny: Lord of Light