The Eternal Champion is a fictional creation of the author Michael Moorcock and is a recurrent feature in many of his novels.

The Multiverse, which consists of several universes, many layered dimensions, spheres, and alternate worlds, is the place where the eternal struggle between Law and Chaos, the two main forces of Moorcock's worlds, takes place. In all these dimensions and worlds, these forces constantly war for supremacy. But the victory of either Law or Chaos would be disastrous for mankind, and therefore the Balance needs to work for a neutral balance.

The Eternal Champion, a Hero who exists in all dimensions, times and worlds, is the one who's chosen by fate to fight for the Balance; however, he often doesn't know of his rôle, or, even worse, he struggles against it, never to succeed.[citation needed] (See the plot summaries for the various novels directly or indirectly linked to in this article.)

All the incarnations of the Eternal Champion are facets of each other, and the Champion may also be incarnated as Companion to another of his incarnations, or as Champion for an opposing force. (It is not certain whether any of the Champion's Consorts have themselves been Champion-incarnations.)