The Steel Tsar is the third novel in the Oswald Bastable trilogy, A Nomad of the Time Streams, by Michael Moorcock. It is a sequel to The Land Leviathan and was originally published in the United Kingdom by Granada Books.
The novel was heavily revised and rewritten for its inclusion in the Orion/White Wolf omnibus of A Nomad of the Time Streams to the extent that it is virtually a different novel. Moorcock has expressed his dissatisfaction with the original novel, which was written when his marriage to Jill Riches was breaking up.