When searching OneSearch for Fantasy novels, search under the author or title, if known. If not, search under Fantasy fiction.
Watership Down by 
A Wrinkle in Time by 
The Lion, the Witch and the Wardrobe by C.S. Lewis (1898-1963) - Narnia Tales (7 vols.)
J. R. R. Tolkien (1892-1973) - Lord of the Ring Trilogy, The Hobbit, and The Silmarillon
Edgar Rice Burroughs (1875-1950) - John Carter on Mars Series and Tarzan Series
L. Frank Baum (1856-1919) - Wizard of Oz and Land of Oz series.
T.H. White (1906-1964) - Once and Future King
Stephen Donaldson (1947- ) - The Chronicles of Thomas Covenant, the Unbeliever and The Second Chronicles of Thomas Covenant
Richard Adams (1920- ) - Watership Down
Madeleine L’Engle (1918-2007) - A Wrinkle in Time, A Swiftly Tilting Planet, and A Wind in the Door
Ursula LeGuin (1929- ) - Wizard of Earthsea Series, Lathe of Heaven, Winds Twelve Quarters
J. K. Rowling (1965 - ) - Harry Potter Series
Marion Zimmer Bradley (1930-1999) - The Mists of Avalon Series
Philip Pullman (1946 - ) - Dark Materials Trilogy (The Golden Compass, The Subtle Knife, The Amber Spyglass.)
Patricia A. McKillip (1948 - ) - Riddlemaster Trilogy (The Riddlemaster of Hed; Heir of Sea and Fire; Harpist in the Wind).
George R.R. Martin (1948 - ) - Song of Ice and Fire Series (Game of Thrones, Clash of Kings, etc.)
Steven King ( ) - Dark Tower Series, Eyes of the Dragon
The following Top 100 Fantasy novels were seleced by David Pringle in his 1989 book - Modern Fantasy: The One Hundred Best Novels.