Alastair Reynolds is a British science fiction author who has written several series set in the same fictional universe. His work is known for its hard science fiction style and focus on space exploration. Many of his books are stand-alone novels, but some are part of ongoing series. Here is a guide to the order in which you should read Alastair Reynolds books:
The Revelation Space series consists of five novels and three short stories set in the same universe. The novels can be read in any order, but it is recommended to start with either Revelation Space or Redemption Ark. The other novels in the series are Absolution Gap, Chasm City, The Prefect, and Pushing Ice. The three short stories are Diamond Dogs, Turquoise Days, and Galactic North.
The Poseidon's Children series is a trilogy consisting of the novels Blue Remembered Earth, On the Steel Breeze, and Poseidon's Wake. It is recommended to read these novels in order.
The Prefect is a stand-alone novel set in the same universe as the Revelation Space series. It can be read at any time after reading one or more of the other books set in this universe.
House of Suns is a stand-alone novel that does not share continuity with any of Reynolds' other work. It can be read at any time.