Two To Conquer is a science fantasy novel by American writer Marion Zimmer Bradley; it is part of the Darkover series, set at the end of Ages of Chaos, in the period of Darkover's history known as the Hundred Kingdoms. The book's introduction places it two hundred years after the events in the book entitled Stormqueen!.

Marion Eleanor Zimmer Bradley was an American author of fantasy, historical fantasy, science fiction, and science fantasy novels, and is best known for the Arthurian fiction novel The Mists of Avalon and the Darkover series. Noted for the feminist perspective in her writing, her reputation has been posthumously marred by her daughter Moira Greyland's accusations of child sexual abuse, and for allegedly assisting her second husband, convicted child abuser Walter Breen, in sexually abusing multiple unrelated children.