Maddadam series by Margaret Atwood.

The Silo series by Hugh Howey. It takes place in the nuclear apocalypse and everyone lives in underground silos that go down over a hundred floors.

The first book is Wool Omnibus. I should warn you it was turned into a series but it originally started as short stories.

I recommend Children of Men by Phyllis White. It's also a pretty good movie. Really unique take on the end of the world, however I would categorize this more as a dystopian plot rather than post apocalyptic.

Frost and Fire is one of Ray Bradbury's stories that I will never forget. His entire collection is fantastic but this one really grabbed me.

The expanse series is a brilliant book series for sci-fi lovers. It is all grounded in real world physics by and large so spaceships combat is limited by human G forces, and take place over weeks at a time from 1000's of kilometres away. Very fun.

Hello. Per rule 3.3, please post book recommendation requests in /r/SuggestMeABook or in our Weekly Recommendation Thread. Thank you.

Cloud Atlas has a good section set after the collapse of society.

For films The Postman is fun, if cheesy.