Alec Turner and The_Wintermute are on point with their suggestions. My list:
Single books
Cryptonomicon - Neal Stephenson
Neuromancer - William Gibson
This Perfect Day - Ira Levin
Atlas Shrugged - Ayn Rand
Meditations - Marcus Aurelius
The Daily Stoic - Ryan Holiday
The Martian - Andy Weir
The Grapes of Wrath - John Steinbeck
Brave New World - Aldous Huxley
1984 - George Orwell
The Man in the High Castle - Philip K. (All his works are great, but I stuck to my favourite)
The Complete Fiction of H.P. Lovecraft - H.P. Lovecraft
The Stand - Stephen King
The Road - Cormac McCarthy
I am Legend - Richard Matheson (The movie is not a valid basis of judgement. Goes against the main premise of the book).
Altered Carbon - Richard K. Morgan
American Gods - Neil Gaiman. (His short story "
A Study in Emerald" is probably my favourite short story of all time. Also his Sandman comics are incredible)
Series (
The Commonwealth Saga / The Void Trilogy - Peter F. Hamilton
The Expanse - James S.A. Corey
A Song of Ice and Fire - George R.R. Martin. (I would recommend waiting till it's finished though. I read the first book in 1996, and I'm still waiting for closure).
Malazan Book of the Fallen - Steven Erikson
The Wheel of Time - Robert Jordan
Ack, I got carried away. Apologies.
edit: forgot Neil Gaiman!