The Gods of Mars by Edgar Rice Burroughs
Pre-Tolkien Fantasy
382 books — 366 voters

Stranger in a Strange Land by Robert A. Heinlein
Best Science Fiction of the 20th Century
553 books — 481 voters
The Martian by Andy Weir
Best Science Fiction of the 21st Century
1,208 books — 8,954 voters

The Hitchhiker’s Guide to the Galaxy by Douglas Adams
Best Science Fiction
3,651 books — 6,977 voters
1984 by George Orwell
Best Dystopian and Post-Apocalyptic Fiction
3,749 books — 25,991 voters

The Sword of Shannara Trilogy by Terry Brooks
The Best Epic Fantasy (fiction)
4,208 books — 25,723 voters
The Hobbit, or There and Back Again by J.R.R. Tolkien
Best Books of the 20th Century
7,807 books — 49,788 voters

The Name of the Wind by Patrick RothfussGoodnight Moon by Margaret Wise BrownHarry Potter and the Sorcerer's Stone by J.K. RowlingIt by Stephen  KingThe Ultimate Hitchhiker’s Guide to the Galaxy by Douglas Adams
Best Books Ever
76,094 books — 282,855 voters