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.

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.

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.

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

For films The Postman is fun, if cheesy.