Redemption Ark is a science fiction book by author Alastair Reynolds. It is the second book in the Revelation Space series. The novel was named "Best Science Fiction Novel of the Year" by Chronicle magazine.

The plot of "Redemption Ark" involves the pursuit of the 'hell class' weapons found on the ship Nostalgia for Infinity in Revelation Space. In Reynolds universe, humanity has split into two factions. The Conjoiners are humans who have incorporated technology that's allows them to share thoughts. A bloody battle resulted in a separation and eventually an on-going war that has worn both sides down to a 'war is routine' mentality. The events of Revelation Space have tipped the balance that had existed and now the Conjoiners are looking to take control of Nostalgia for Infinity. Skade is the woman closest to being the leader of the Conjoiners by virtue of being part of every circle of government within the telepathic faction. When she recovers a long lost Conjoiner exploration craft, the events that propel the novel are set into motion.