Olivia Williams is an English film, stage, and television actress. Theatre credits include Waste, Happy Now, and Love's Labour's Lost (National Theatre); Scenes From a Marriage (St. James Theatre); In A Forest Dark and Deep (Vaudeville Theatre); The Changeling (Cheek by Jowl); Hotel in Amsterdam (Donmar Warehouse), and Peer Gynt, Wallenstein, The Wives' Excuse, and Misha's Party (Royal Shakespeare Theatre).

Television credits include Salting the Battlefield, Manhattan, Miss Austen Regrets, A Life in Pictures, Krakatoa—The Last Days, and Friends.

Film credits include Maps to the Stars, Last Days on Mars, An Education, Sex and Drugs and Rock and Roll, Anna Karenina, Rushmore, The Sixth Sense, The Postman, The Ghost, winning National Critics' and London Critics' Circle Awards for Best Supporting Actress, and The Heart of Me, winning a British Independent Film Award for Best Supporting Actress.

BBC Radio credits include Old Times, The Significance of Hair, and Ada Lovelace.