Catherine Cusack is an English actress of Irish descent, best known for portraying Nanny Carmel Finnan in long-running ITV soap opera Coronation Street in 1992 and 1993. She is the half-sister of the actresses Sinéad Cusack, Sorcha Cusack and Niamh Cusack and the theatre producer Pádraig Cusack and TV producer Paul Cusack. She is the fourth daughter of the Irish actor Cyril Cusack and his future second wife Mary Rose Cunningham, their only child together. She is married to the British actor Alex Palmer.