The Time Traveler's Wife by Audrey NiffeneggerOutlander by Diana GabaldonThe Time Machine by H.G. Wells11/22/63 by Stephen        KingA Wrinkle in Time by Madeleine L'Engle
Best Time Travel Fiction
1,953 books — 5,236 voters
The Hunger Games by Suzanne CollinsDivergent by Veronica RothThe Handmaid’s Tale by Margaret AtwoodCinder by Marissa MeyerThe Host by Stephenie Meyer
Best Science Fiction With a Female Protagonist
1,387 books — 2,818 voters

Ender’s Game by Orson Scott CardStarship Troopers by Robert A. HeinleinOld Man's War by John ScalziThe Forever War by Joe HaldemanOn Basilisk Station by David  Weber
Military Science Fiction
837 books — 1,134 voters
Oryx and Crake by Margaret AtwoodThe Windup Girl by Paolo BacigalupiParable of the Sower by Octavia E. ButlerThe Year of the Flood by Margaret AtwoodThe Water Knife by Paolo Bacigalupi
Cli-Fi: Climate Change Fiction
417 books — 614 voters

The Martian by Andy WeirReady Player One by Ernest ClineLeviathan Wakes by James S.A. CoreyRed Rising by Pierce BrownAncillary Justice by Ann Leckie
Science Fiction - 2010-2019
548 books — 782 voters
Old Man's War by John ScalziThe Hunger Games by Suzanne CollinsAltered Carbon by Richard K. MorganThe Road by Cormac McCarthyRevelation Space by Alastair Reynolds
Classic Science Fiction - 2000-2009
309 books — 241 voters