Batman: Joker War Reading Order, a Batman event by James Tynion IV

Written by James Tynion IV and illustrated by Jorge Jimenez, Batman: The Joker War is taking us to issue #100 of the series with a story in which The Clown Prince of Crime and the Dark Knight Detective go head-to-head for the last time.

So, here is the official synopsis: The Joker has never wanted to win before, he’s never wanted his battle with Batman to end, but now his motivation has shifted. As The Joker’s plan to assemble an army materializes, the only person who can save Batman from the brink of true madness is Harley Quinn. And while all this is happening, the villains of Gotham City are waiting out the carnage Joker has unleashed—and Catwoman assembles an army of her own!

What to read before Batman: Joker War?

Batman: Their Dark Designs
Collects Batman #86-94. This is the previous storyline written by James Tynion IV, which took place before the Joker War. It’s a new day in Gotham City, but not the same old Batman. With Bane vanquished and one of his longtime allies gone, Batman has to start picking up the pieces and stepping up his game. Batman has a new plan for Gotham City, but he’s not the only one. Deathstroke has returned as well, under a mysterious new contract that could change everything.

You can also find a little bit of a prelude to the Joker War in the following issues, showing Joker preparing for the War. These storylines are optional:

Detective Comics #1022-1024
Nightwing #71-73

Batman: Joker War Collected Editions

The Joker War Saga
Collects Batman #95-100, Batgirl #47, Detective Comics #1025, Red Hood: Outlaw #48, Nightwing #74, The Joker War Zone #1, plus stories from Harley Quinn #75 and Catwoman #25
Batman: The Joker War
Collects Batman #95-100.
Nightwing: The Joker War
Collects Nightwing #70-77, Nightwing Annual #3.
Detective comics: The Joker War
Collects Batman: Pennyworth RIP, Detective Comics #1020-1026, an 8-page story from Detective Comics #1027 and Detective Comics Annual #3.
Batgirl: The Joker War
Collects Batgirl #45-50.