Yvain, the Knight with the Lion (French: Yvain, le Chevalier au Lion) is a romance by Chrétien de Troyes. It was probably written in the 1170s simultaneously with Lancelot, the Knight of the Cart, and includes several references to the narrative of that poem.

It is a story of knight-errantry, with the protagonist Yvain being exiled from the favours of his lady being required to perform a number of heroic deeds before regaining her.