Poseidon's Wake is a science fiction novel by Welsh author Alastair Reynolds. It forms the conclusion of Reynolds' Poseidon's Children future history trilogy, which follows the expansion of humanity and its transhuman descendants into the galaxy over the course of many centuries. Poseidon's Wake follows Blue Remembered Earth (2012) and On the Steel Breeze (2013), and was published by Gollancz on 30 April 2015.