Sinead Matthews (born circa 1980-1981) is an English actress whose credits include film, television, and stage. Her notable TV roles include Marcia Williams in The Crown. She was born in Coventry, England. She attended Coventry's Cardinal Wiseman Catholic School, and studied A-level Drama at Stratford-upon-Avon College between 1996 and 1998. She graduated from RADA in 2003.