The Great Dune Trilogy by Frank HerbertThe Foundation Trilogy by Isaac AsimovThe Ultimate Hitchhiker’s Guide to the Galaxy by Douglas AdamsThe Ender Quartet Box Set by Orson Scott CardThe Hyperion Omnibus by Dan Simmons
Best Science Fiction Series
453 books — 1,150 voters

Dune by Frank HerbertOld Man's War by John ScalziLeviathan Wakes by James S.A. CoreyStarship Troopers by Robert A. HeinleinPandora's Star by Peter F. Hamilton
Excellent Space Opera
1,138 books — 3,976 voters
Hyperion by Dan SimmonsDune by Frank HerbertEnder’s Game by Orson Scott CardFoundation by Isaac AsimovLeviathan Wakes by James S.A. Corey
Best Space Opera
1,150 books — 1,981 voters

The Martian by Andy WeirRevelation Space by Alastair ReynoldsDune by Frank HerbertFoundation by Isaac AsimovRendezvous with Rama by Arthur C. Clarke
best hard science fiction
450 books — 849 voters
Dune by Frank HerbertDo Androids Dream of Electric Sheep? by Philip K. DickThe Forever War by Joe HaldemanHyperion by Dan SimmonsFlowers for Algernon by Daniel Keyes
SF Masterworks
200 books — 727 voters