Sinéad Cusack
- The Three Urns
2026 Deirdre
- And Mrs.
2024 Lorraine
- National Theatre Live: People, Places and Things
2024 Doctor/Therapist/Mum
- Napoleon
2023 Letizia Bonaparte
- Beast
2018 Penelope
- National Theatre Live: King Lear
2018 Kent
- Queen & Country
2015 Grace Rohan
- Stonehearst Asylum
2014 Mrs. Pike
- The Sea
2013 Anna Morden
- Wrath of the Titans
2012 Clea
- Cracks
2009 Miss Nieven
- Eastern Promises
2007 Helen
- A Room with a View
2007 Miss Lavish
- V for Vendetta
2006 Delia Surridge
- The Tiger's Tail
2006 Oona O'Leary
- Mathilde
2006 Wife of Col. De Petris
- Dad
2005 Sandy James
- Summer Solstice
2005 Elfrida
- The Strange Case of Sherlock Holmes & Arthur Conan Doyle
2005 Mary Doyle
- I Capture the Castle
2003 Mrs Cotton
- Winter Solstice
2003 Elfrida Phibbs
- Dream
2001 Kathleen
- My Mother Frank
2000 Frances 'Frank' Kennedy
- Passion of Mind
2000 Jessie
- The Nephew
1998 Brenda O'Boyce
- Food for Ravens
1997 Jennie Lee
- Stealing Beauty
1996 Diana Grayson
- Uncovered
1995 Menchu
- Sparrow
1994 Matilde
- The Cement Garden
1993 Mother
- Bad Behavior
1993 Ellie McAllister
- Waterland
1992 Mary Crick
- Tales from Hollywood
1992 Nelly Mann
- God on the Rocks
1992 Ellie Marsh
- The Hen House
1989 Lily
- Venus Peter
1989 Miss Balsilbie
- Rocket Gibraltar
1988 Amanda 'Billi' Rockwell (as Sinead Cusack)
- Cyrano de Bergerac
1985 Roxanne
- Twelfth Night
1980 Olivia
- The Kitchen
1977 Monique
- The Last Remake of Beau Geste
1977 Isabel Geste
- Love's Labour's Lost
1975 Rosaline
- The Playboy of the Western World
1974 Margaret Flaherty (Pegeen Mike)
- Horowitz in Dublin
1973 Liz
- The Eyes Have It
1973 Sally
- Revenge
1971 Rose
- Hoffman
1970 Miss Smith
- The Ballad of Tam Lin
1970 Rose
- A Sound from the Sea
1970 Catherine
- The Dolly Scene
1970 Anna
- The Rise and Rise of Michael Rimmer
1970 Yvonne (Uncredited)
- David Copperfield
1969 Emily
