If you haven’t read any William Gibson then stop what you are doing and don’t come back till you have.
Then there are many classics along the 1984 theme such as
Fahrenheit 451 by Ray Bradbury,
A Clockwork Orange by Anthony Burgess
Do Androids Dream of Electric Sheep? by Philip K. Dick (well pretty much anything by Dick)
The Handmaid’s Tale by Margaret Atwood
The Children of Men by P.D. James
Jennifer Government by Max Barry
Dayworld by Philip José Farmer
The Running Man by Richard Bachman (really Stephen King, but we all know that), Logan’s Run by William F. Nolan and George Clayton Johnson
Immortality, Inc. by Robert Sheckley.
If you want some heavy duty Sci-Fi then Consider Phlebas or Use of Weapons by Iain M Banks are both excellent as are all his other books. They tend to be very dark and even his non science fiction verges on the weird.
And finally, slightly more main stream but still entertaining is The Historian by Elizabeth Kostova. A modern day Dracula story that avoids the usual vampire melodrama.