Yvgenie is a fantasy novel by American science fiction and fantasy author C. J. Cherryh. It was first published in October 1991 in the United States in a hardcover edition by Ballantine Books under its Del Rey Books imprint. Yvgenie is book three of Cherryh's three-book Russian Stories trilogy set in medieval Russia in forests along the Dnieper River near Kyiv in modern-day Ukraine. The novel draws on Slavic folklore and concerns the fate of a girl who has drowned and become a rusalka. It is also an exploration of magic and the development of a young wizard.

In Slavic mythology, vodyanoy is a water spirit. In Czech and Slovak fairy tales, it is called vodník, and it is considered to be the equivalent creature as the Wassermann or nix of German fairy tales. In Ukrainian fairy tales, it is called “водяник“ (vodyanyk).