Louis L'Amour
HP Lovecraft
Robert E. Howard
Edgar Allan Poe
John Steinbeck.
Robert Heinlien
James Lee Burke
JT Edson
Michael Moorcock
Leigh Brackett
Big into Sword & Sorcery/Heroic Fantasy
I'm also big into the fantasy genre. Nothing disappoints more than the fact most new stuff is Roman-tasy.
As a teen-ager, I tore through all the Conan books, then Howard's other stuff. Around the same time I read all of Moorcock and a smidge of Brackett.
Steinbeck was strictly a slog through Grapes of Wrath for school.
Heinlien was a later addiction. I devoured all of his books as a young sailor.
Hemingway
Vonnegut
Percival Everett
I liked Hemingway, but loved Vonnegut. My youngest daughter is a recent devotee of his work and that makes me proud.
Robert E Howard - Conan books on their own are enough.
Tolkien - just for the Hobbit. Not really a fan of the rest as yet.
Frank Herbert - Just for Dune .
Anne McCaffrey - the Dragon books of Pern
Piers Anthony - Xanth and all his other stuff
CS Forrester or Dudley Pope - Naval fiction
As previously stated, Howard was a favorite.
As a young DnD nerd (chicken or the egg?), I had to read Tolkien's LOTR, but enjoyed The Hobbit more. Try Farmer Giles of Ham....
The Dragonrider books were OK, but the Xanth novels really did it for me.
If you like CS Forrester and Dudley Pope, try Alexander Kent's Bolitho series and Patrick O"Brian's Aubrey–Maturin series. I can't get enough of these types of books.
Stephen King
Lovecraft
Bernard Cornwell
Dostoyevsky
Robert Heinlein
Ramsey Campbell
Ursula K Le Guin
China Mieville
Dan Simmons
Ernest Hemingway
Some authors I talked about already, but big up for Bernard Cornwell! Sharpe may be my favorite (but don't make me pick). I was reading one of the series in line for chow onboard a US Submarine, when the Captain saw me. He said he was a big fan and asked what I thought of Sharpe's philosophy. I was at a loss because Sharpe had just murdered his C.O. in the story.
Some additions to the list:
I recommend William Gibson -Neuromancer, Count Zero and his other early works particularly.
Naomi Novak's Temeraire series - Combines my love of Dragons with my love of Naval fiction during the Napoleonic war.
Allan Mallinson's Matthew Hervey books, very similar to the Sharpe series but with a less roguish protagonist.