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.

The Capture is a British mystery thriller television series created, written and directed by Ben Chanan, and starring Holliday Grainger, Callum Turner, Laura Haddock, Ben Miles, Cavan Clerkin, Paul Ritter, and Ron Perlman.