NewTrinity War

This was hyped as the first big crossover event of the New 52, the culmination of two years of foreshadowing…
…which turned out to the be not quite true: it’s not the culmination of anything – it’s actually the prologue to Forever Evil.

Also, every single issue of this storyline is collected in the Trinity War hardcover. The purpose of this reading order is to help show which issues appear in which volumes of the regular series titles. It can be found here on the timeline.

Prologue
Free Comic Book Day 2012 #1	Trinity of Sin – Pandora, vol.1: The Curse Justice League: Trinity War
Trinity of Sin: Pandora #1	Trinity of Sin – Pandora, vol.1: The Curse Justice League: Trinity War
The Trinity War
Justice League #22	Justice League, vol.4: The Grid Justice League: Trinity War
Justice League of America #6	Justice League of America, vol.1: World’s Most Dangerous Justice League: Trinity War
Justice League Dark #22	Justice League Dark, vol.4: The Rebirth of Evil Justice League: Trinity War
Constantine #5 [1]	Constantine, vol.1: The Spark and the Flame Justice League: Trinity War
Justice League #23	Justice League, vol.4: The Grid Justice League: Trinity War
Trinity of Sin: Pandora #2 [2]	Trinity of Sin – Pandora, vol.1: The Curse Justice League: Trinity War
Trinity of Sin: The Phantom Stranger #11	Trinity of Sin – The Phantom Stranger, vol.2: Breach of Faith Justice League: Trinity War
Justice League of America #7	Justice League of America, vol.1: World’s Most Dangerous Justice League: Trinity War
Trinity of Sin: Pandora #3 [3]	Trinity of Sin – Pandora, vol.1: The Curse Justice League: Trinity War
Justice League Dark #23	Justice League Dark, vol.4: The Rebirth of Evil Justice League: Trinity War

Notes:

1. A largely pointless side-story involving Constantine and Shazam. Can safely be skipped.
2. A side story tracking Pandora and foreshadowing Forever Evil, but not strictly necessary.
3. A side story that confusingly refers to itself as occurring both after and before Justice League Dark #23.