Holliday Clark Grainger, also credited as Holly Grainger, is an English screen and stage actress. Some of her prominent roles are Kate Beckett in the BAFTA award-winning children's series Roger and the Rottentrolls, Lucrezia Borgia in the Showtime series The Borgias, Robin Ellacott in the Strike series, DI Rachel Carey in the Peacock/BBC One crime drama The Capture and Estella in Mike Newell's adaptation of Great Expectations.

Lucrezia Borgia was an Italian noblewoman of the House of Borgia who was the illegitimate daughter of Pope Alexander VI and Vannozza dei Cattanei. She reigned as the governor of Spoleto, a position usually held by cardinals, in her own right.