Nuclear Apocalypse
I'm not sure we've ever read a PA novel here at the club, though I've professed my love for A Canticle for Liebowitz many times.
Here's a list of post nuclear war stories - I've read two (Alas Babylon being the other - in high school english class), heard of a few others. But most I have not heard of before.

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Comments
It's been years and years since I've read Canticle. Easily over a decade. I've never read the sequel, Saint Leibowitz and the Wild Horse Woman, though I own it.
I have read the Varley short story. Not my favorite, but it's quirky. Some of these others need to go into my library queue!
@dr_mitch Wasn't The Girl With All the Gifts just apocalyptic? I mean, the apocalypse in that book is still happening, right?
I tend to like stories about rebuilding rather than falling apart, personally. One of the reasons I liked the Canticle.
Actually, we did read Wool by Hugh Howey - that was definitely PA.
@clash_bowley There are quite a few about re-building, and I really enjoy those, too. David Brin's The Postman does this.
Yes, I liked the Postman too. That is exactly the kind of PA I enjoy most. It's the chance to do something different, and maybe better.
It kind of bluffed us, right? I mean it looked post-apocalyptic until the full apocalypse.
Oh, the Postman was rather fun. And yes to rebuilding.
Another I liked (albeit more like a vampire apocalypse than anything else) was Justin Cronin's The Passage.
TGWATG was definitely pre-post-apocalyptic!