Sweeney Todd is a fictional English serial killer who first appeared as one of the protagonists of a penny dreadful serial entitled The String of Pearls (1846-1847).
In this and later versions of the tale he is a barber who murders wealthy customers by pulling a lever while they are in his barber chair which, unknown to them, is fixed to a revolving trap-door, making them fall backward into the basement, generally causing them to break their necks or skulls as they hit the ground. Just in case they are alive, he goes to the basement and "polishes them off", meaning he slits their throats with a cut-throat razor. After Todd has robbed his dead victims of their goods, Mrs. Lovett, his partner in crime (in some later versions, his friend or lover), assists him in disposing of the bodies by having their flesh baked into meat pies, and selling them to the unsuspecting customers of her pie shop. Todd's barber shop is situated at 186 Fleet Street, London, next to St. Dunstan's church, and is connected to Mrs. Lovett's pie shop in nearby Bell Yard by means of an underground passage.
The tale surrounding the character became a staple of Victorian melodrama and a Tony award-winning Broadway musical in 1979. Sweeney Todd has also been featured in several films, the most recent being Sweeney Todd: The Demon Barber of Fleet Street (2007), directed by Tim Burton, with Johnny Depp in the title role.