Sinad Moira Cusack (born 18 February 1948) is an Irish stage, television and film actress. She 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). Cusack was born Jane Moira Cusack in Dalkey, County Dublin, the daughter of Maureen Cusack (ne Kiely) and Cyril Cusack, both actors. She is the sister of actresses Sorcha Cusack, Niamh Cusack and half-sister to Catherine Cusack. Her first acting roles were at the Abbey Theatre in Dublin. In 1970, she starred with Peter Sellers in the film Hoffman. In 1971, she guest starred in an episode of The Persuaders! (starring Tony Curtis and Roger Moore) as Jenny Lindley, a wealthy heiress who suspects that a man claiming to be her dead brother is in fact an impostor. In 1975, she moved to London and joined the Royal Shakespeare Company.
Contributions by All Hallow's Wraith, Lord Cornwallis, and Artoasis.