Judith Tarr (born 1955) is an American author, best known for her fantasy books. She received her B.A. in Latin and English from Mount Holyoke College in 1976, and has an M.A. in Classics from Cambridge University, and an M.A. and Ph.D. in Medieval Studies from Yale University. She taught Latin at Wesleyan University from 1990-1993.
She breeds Lipizzan horses at Dancing Horse Farm, her home in Vail, Arizona. The romantic fantasies that she writes under the name Caitlin Brennan feature dancing horses modeled on those that she raises.