These are just the ones that come to mind right now, but I'm sure there's more:

— Dune by Frank Herbert

— Hyperion by Dan Simmons

— 11/22/63 by Stephen King

— Brilliance by Marcus Sakey

— Batman: The Long Halloween by Jeph Loeb & Tim Sale

— The Cuckoo's Calling by Robert Galbraith

— The Gray Man by Mark Greaney

— I'd Like To Play Alone Please by Tom Segura

— Anxious People by Fredrik Backman

— The Last Wish by Andrzej Sapkowski

— Little Big Man by Thomas Berger

— Fahrenheit 451 by Ray Bradbury

— The Girl with the Dragon Tattoo by Stieg Larsson

— Project Hail Mary by Andy Weir

— The Martian by Andy Weir

— A Gentleman In Moscow by Amor Towles

— The Drop by Dennis Lehane

— The Road by Cormac McCarthy

These come to mind either because they got me hooked on a specific author for a while, or they got me into a specific genre, but they're all wonderful either on their own, or the start to a great series. And I'm not sure how many comedians have written books, but Tom Segura's is genuinely funny. Haven't laughed while reading a book like that maybe ever.