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The 21 Must Read Fantasy Books of All Time
(booksofbrilliance.com)
Here's the list from the article:
The Lord of the Rings Trilogy by J. R. R. Tolkien
A Song of Ice and Fire Series by George R.R Martin
American Gods by Neil Gaiman
His Dark Materials by Philip Pullman
Mistborn Series by Brandon Sanderson
The Wheel of Time series by Robert Jordan
Dune by Frank Herbert
The Night Angel by Brent Weeks
The Night Circus by Erin Morgenstern
The First Law series by Joe Abercrombie
The Dresden Files by Jim Butcher
A Wizard of Earthsea by Ursula K. Le Guin
The Graveyard Book by Neil Gaiman
Discworld by Terry Pratchett
The Fifth Season by N.K. Jemisin
The Way of Kings by Brandon Sanderson
Foundryside by Robert Jackson Bennett
The Hunger Games by Suzanne Collins
The Chronicles of Narnia by C.S. Lewis
The Kingkiller Chronicle, #1 by Patrick Rothfuss
Temeraire by Naomi Novik
For me a lot of these are solid, but some are pretty questionable. I regret the time I spent with Night Angel, for example, and found Hunger Games to be entertaining, but not substantial enough to get past the first book.