Len Cariou (born September 30, 1939 in Saint Boniface, Manitoba) is a Canadian actor.
Cariou is best known for his role as Sweeney Todd in the original 1979 production of the Stephen Sondheim musical: Sweeney Todd: The Demon Barber Of Fleet Street.
He has also had appearances onstage in the musicals Applause (1970), A Little Night Music (1973), and recently, in the Tony Award winning play Proof with Anne Heche, Mary-Louise Parker, and Jennifer Jason Lee . On film, Cariou can be seen in About Schmidt (2002), Thirteen Days (2000), Lady In White (1988), and also in television appearances such as The West Wing, Law And Order , The Practice and Murder She Wrote.