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
412 books — 1,088 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
1,006 books — 3,569 voters
Hyperion by Dan SimmonsDune by Frank HerbertEnder’s Game by Orson Scott CardFoundation by Isaac AsimovOld Man's War by John Scalzi
Best Space Opera
1,081 books — 1,729 voters

The Martian by Andy WeirRevelation Space by Alastair ReynoldsFoundation by Isaac AsimovDune by Frank HerbertRendezvous with Rama by Arthur C. Clarke
best hard science fiction
392 books — 718 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
197 books — 722 voters