This isn't meant to be my final list of "essential" sci-fi, but it should give some ideas to get the discussion going. I
do consider all these books to be important ones, though.
Douglas Adams
- <font size="2" face="Verdana, Arial">The Hitch-hiker's Guide to the Galaxy
<font size="2" face="Verdana, Arial">Brian Aldis
- <font size="2" face="Verdana, Arial">The Helliconia Trilogy
<font size="2" face="Verdana, Arial">Isaac Asimov
- <font size="2" face="Verdana, Arial">The Caves of Steel
- <font size="2" face="Verdana, Arial">The Naked Sun
- <font size="2" face="Verdana, Arial">The Robots of Dawn
- <font size="2" face="Verdana, Arial">The Foundation series
<font size="2" face="Verdana, Arial">Pierre Boulle
- <font size="2" face="Verdana, Arial">Planet of the Apes
<font size="2" face="Verdana, Arial">Ray Bradbury
- <font size="2" face="Verdana, Arial">The Martian Chronicles
- <font size="2" face="Verdana, Arial">Farenheit 451
<font size="2" face="Verdana, Arial">David Brin
- <font size="2" face="Verdana, Arial">Startide Rising
<font size="2" face="Verdana, Arial">Anthony Burgess
- <font size="2" face="Verdana, Arial">A Clockwork Orange
<font size="2" face="Verdana, Arial">Edgar Rice Burroughs
- <font size="2" face="Verdana, Arial">The John Carter of Mars series
<font size="2" face="Verdana, Arial">Orson Scott Card
- <font size="2" face="Verdana, Arial">Ender's Game
<font size="2" face="Verdana, Arial">Michael Chriton
- <font size="2" face="Verdana, Arial">The Andromeda Strain
<font size="2" face="Verdana, Arial">Arthur C. Clarke
- <font size="2" face="Verdana, Arial">Childhood's End
- <font size="2" face="Verdana, Arial">Rendezvous With Rama
<font size="2" face="Verdana, Arial">Gordon R. Dickson
- <font size="2" face="Verdana, Arial">Dorsai!
<font size="2" face="Verdana, Arial">Philip Jose Farmer
- <font size="2" face="Verdana, Arial">The Riverworld Series
<font size="2" face="Verdana, Arial">William Gibson
- <font size="2" face="Verdana, Arial">Neuromancer
<font size="2" face="Verdana, Arial">Joe Haldeman
- <font size="2" face="Verdana, Arial">The Forever War
<font size="2" face="Verdana, Arial">Harry Harrison
- <font size="2" face="Verdana, Arial">The Stainless Steel Rat Series
- <font size="2" face="Verdana, Arial">The Eden Trilogy
<font size="2" face="Verdana, Arial">Robert Heinlein
- <font size="2" face="Verdana, Arial">Stranger In a Strange Land
- <font size="2" face="Verdana, Arial">The Puppet Masters
- <font size="2" face="Verdana, Arial">Starship Troopers
<font size="2" face="Verdana, Arial">Frank Herbert
- <font size="2" face="Verdana, Arial">Dune
<font size="2" face="Verdana, Arial">Ursula K. LeGuin
- <font size="2" face="Verdana, Arial">The Lathe of Heaven
- <font size="2" face="Verdana, Arial">The Left Hand of Darkness
<font size="2" face="Verdana, Arial">Anne McCaffrey
- <font size="2" face="Verdana, Arial">Decision at Doona
<font size="2" face="Verdana, Arial">Walter M. Miller, Jr.
- <font size="2" face="Verdana, Arial">A Canticle for Leibowitz
<font size="2" face="Verdana, Arial">Larry Niven
- <font size="2" face="Verdana, Arial">Ringworld
<font size="2" face="Verdana, Arial">Larry Niven and Jerry Pournelle
- <font size="2" face="Verdana, Arial">Lucifer's Hammer
- <font size="2" face="Verdana, Arial">Footfall
- <font size="2" face="Verdana, Arial">The Mote In God's Eye
<font size="2" face="Verdana, Arial">Frederik Pohl
- <font size="2" face="Verdana, Arial">Gateway
<font size="2" face="Verdana, Arial">Mary Shelley
- <font size="2" face="Verdana, Arial">Frankenstein
<font size="2" face="Verdana, Arial">Dan Simmons
- <font size="2" face="Verdana, Arial">Hyperion
<font size="2" face="Verdana, Arial">E.E. "Doc" Smith
- <font size="2" face="Verdana, Arial">The Chronicles of the Lensmen
<font size="2" face="Verdana, Arial">Neal Stephenson
- <font size="2" face="Verdana, Arial">Snow Crash
<font size="2" face="Verdana, Arial">Jules Verne
- <font size="2" face="Verdana, Arial">20,000 Leagues Under the Sea
- <font size="2" face="Verdana, Arial">Journey to the Center of the Earth
<font size="2" face="Verdana, Arial">Kurt Vonnegut
- <font size="2" face="Verdana, Arial">Slaughterhouse Five
<font size="2" face="Verdana, Arial">H.G. Wells
- <font size="2" face="Verdana, Arial">The War of the Worlds
- <font size="2" face="Verdana, Arial">The Time Machine
- <font size="2" face="Verdana, Arial">First Men In the Moon
<font size="2" face="Verdana, Arial">In doing this list, I found <a href="
http://www.fantasticfiction.co.uk" target="_blank">Fantastic Fiction</a> to be a great resource.