Oh man. “All time” is hard because I’ve been through so many phases of my life. I count a favorite as any book I’ve bought, since I’m usually such a library person.
Tween/teen:
The belgariad
Harry Potter
Anything by tamora Pierce (Alana, the circle)
Enders game
Name of the wind (still waiting for doors of stone, damn you Patrick)
Wrinkle in time
The giver
college:
Hyperion
Dune
Mists of Avalon
Now:
The housekeeper and the professor
The house on the cerulean sea
Stories of your life and others
Shit Cassandra saw
The last graduate series
A Court of Thorns and Roses series (it’s a guilty pleasure and I’m ashamed to post it in the same thread as these classics but I’m addicted right now)