The Hobbit, or There and Back Again by J.R.R. TolkienAnd Then There Were None by Agatha ChristieThe A.B.C. Murders by Agatha Christie
Best Books of the Decade: 1930s
903 books — 1,249 voters
The Lord of the Rings by J.R.R. Tolkien
Best Books of the Decade: 1950s
1,180 books — 1,502 voters

Harry Potter and the Philosopher’s Stone by J.K. RowlingHarry Potter and the Prisoner of Azkaban by J.K. RowlingHarry Potter and the Chamber of Secrets by J.K. Rowling
Best Books of the Decade: 1990s
3,140 books — 3,669 voters
Harry Potter and the Deathly Hallows by J.K. RowlingHarry Potter and the Half-Blood Prince by J.K. RowlingHarry Potter and the Goblet of Fire by J.K. RowlingHarry Potter and the Order of the Phoenix by J.K. RowlingThe Da Vinci Code by Dan    Brown
Best Books of the Decade: 2000s
7,203 books — 28,360 voters

The House in the Cerulean Sea by T.J. KluneProject Hail Mary by Andy WeirThe Inheritance Games by Jennifer Lynn BarnesLessons in Chemistry by Bonnie GarmusTomorrow, and Tomorrow, and Tomorrow by Gabrielle Zevin
Best Books of the Decade: 2020's
2,795 books — 4,956 voters
Harry Potter and the Philosopher’s Stone by J.K. RowlingThe Lightning Thief by Rick RiordanThe Hobbit, or There and Back Again by J.R.R. TolkienEragon by Christopher PaoliniThe Secret Garden by Frances Hodgson Burnett
Best Young Adult Books
13,032 books — 80,088 voters

Harry Potter and the Sorcerer's Stone by J.K. RowlingThe Lord of the Rings by J.R.R. TolkienThe Name of the Wind by Patrick RothfussThe Lightning Thief by Rick RiordanEragon, Eldest & Brisingr by Christopher Paolini
Best Fantasy Series, Trilogies, and Duologies
2,039 books — 11,618 voters
J.R.R. Tolkien 4-Book Boxed Set by J.R.R. TolkienEragon by Christopher PaoliniElantris by Brandon Sanderson
The Best Epic Fantasy (fiction)
4,105 books — 25,601 voters

Inheritance by Christopher PaoliniJ.R.R. Tolkien 4-Book Boxed Set by J.R.R. Tolkienעולמה של סופי - רומן על תולדות הפילוסופיה by Jostein Gaarderשחקן מספר אחת by Ernest Clineהבן הבכור by Christopher Paolini
Best Books Ever
75,022 books — 278,367 voters