Thendara House is a science fantasy novel by American writer Marion Zimmer Bradley, part of her Darkover series and a sequel to The Shattered Chain. It was originally published by DAW Books in 1983. The book was co-written by Jacqueline Lichtenberg, without credit.

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.