The Handmaid's Tale by Margaret Atwood is amazing. I read that one a few weeks ago and would have to add that to my list of all-time favourites.
Just a few of mine:
Harper Lee's To Kill a Mockingbird.
Larry's Party by Carol Shields.
In Search of April Raintree by Beatrice Culleton.
Foxfire by Joyce Carol Oates.
The Bluest Eye by Toni Morrison.
Michael Ondaatje's The English Patient.
Hanif Kureishi's The Buddha of Suburbia.
Invisible Man by Ralph Ellison.
Catcher in the Rye by JD Salinger.
Anything of Joe Orton's.
The Bell Jar by Sylvia Plath.
Mercy by Andrea Dworkin.