
Sinéad Moira Cusack (born February 18, 1948) is an Irish actress. Her first acting roles were at the Abbey Theatre in Dublin, before moving to London in 1969 to join the Royal Shakespeare Company. She has won the Critics' Circle and Evening Standard Awards for her performance in Sebastian Barry's Our Lady of Sligo.
Cusack has received two Tony Award nominations: once for Best Leading Actress in Much Ado About Nothing (1985), and again for Best Featured Actress in Rock 'n' Roll (2008). She has also received five Olivier Award nominations for As You Like (1981), The Maid's Tragedy (also 1981), The Taming of the Shrew (1983), Our Lady of Sligo (1998) and Rock 'n' Roll (2007). In 2020, she was listed at number 25 on The Irish Times' list of Ireland's greatest film actors.
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V for Vendetta
2006 · as Delia Surridge

Eastern Promises
2007 · as Helen

Napoleon
2023 · as Letizia Bonaparte

Wrath of the Titans
2012 · as Clea

Stonehearst Asylum
2014 · as Mrs. Pike

Stealing Beauty
1996 · as Diana Grayson

The Cement Garden
1993 · as Mother

Passion of Mind
2000 · as Jessie

Cracks
2009 · as Miss Nieven

The Three Urns
2026 · as Deirdre

Beast
2018 · as Penelope

Dad
2005 · as Sandy James

The Last Days of Rabbit Hayes
as Molly

And Mrs.
2024 · as Lorraine

I Capture the Castle
2003 · as Mrs Cotton

Queen & Country
2015 · as Grace Rohan

Rocket Gibraltar
1988 · as Amanda 'Billi' Rockwell (as Sinead Cusack)

My Mother Frank
2000 · as Frances 'Frank' Kennedy