Sinéad Moira Cusack (; born 18 February 1948) is an Irish stage, television and film actress. Her first acting roles were at the Abbey Theatre in Dublin, before moving to London in 1975 to join the Royal Shakespeare Company. 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).