Marina Sirtis (born 29 March 1955) is an English-American actress. She is best known for her role as Counselor Deanna Troi on the television series Star Trek: The Next Generation and the four feature films that followed.
Marina Sirtis was born in the East End of London, the daughter of working class Greek parents Despina, a tailor's assistant, and John Sirtis. She was brought up in Harringay, North London and emigrated to the U.S. in 1986, later becoming a naturalised U.S. citizen. She auditioned for drama school against her parents' wishes, ultimately being accepted to the Guildhall School of Music and Drama. She is married to rock guitarist Michael Lamper (21 June 1992 – present). Her younger brother, Steve, played football in Greece and played for Columbia University in the early 1980s. Marina herself is an avowed supporter of Tottenham Hotspur F.C.
Sirtis started her career as a member of the repertory company at the Connaught Theatre, Worthing, West Sussex in 1976. Directed by Nic Young, she appeared in Joe Orton's What the Butler Saw and as Ophelia in Hamlet.