Geraldine Margaret Agnew-Somerville is an Irish actress. She is known for her roles in the film Gosford Park (2001) and the Harry Potter film series (2001–2011). Her other roles have included My Week with Marilyn (2011) and Grace of Monaco (2014). In 1995, Somerville was nominated for a BAFTA Award for playing Jane Penhaligon in the television series Cracker from 1993 to 1995.