Thanks to Mouse for making this timeline.

​Chaos; Timeline

Delusion of Zero -> C;H NoAH ≃ Chaos;Gate -> C;H LCC -> Tomorrow in a Box -> C;C CC (flashback) ≃ C;C Drama CD – Fools (flashback) -> C;C The day of the beginning -> C;C ≃ C;C The Memoirs of a Certain Wrong-Sider ≃ C;C Anime Side Story ≃ C;C Drama CD – Fools ≃ C;C Drama CD -> C;C True End -> C;C LCC ≃ C;C The Secluded Valley Path ≃ C;C The Memoirs of a Certain Wrong-Sider (ch.11) -> C;C The Memoirs of a Certain Wrong-Sider (epilogue) -> C;C True End (epilogue) -> C;C CR

Undefined: Enigmatic ward, C;C CC (prologue)

Non-Canon: C;H The parallel bootleg, C;H Blue Complex, Chaos;Head H