Jayne Wisener is an actress and singer from Northern Ireland. She played Johanna in the British-American film Sweeney Todd: The Demon Barber of Fleet Street. She also appeared in an episode of The Inbetweeners, as Lauren Harris.

Johanna is a fictional character appearing in the story of Sweeney Todd. In the original version of the tale, the penny dreadful The String of Pearls (1846–7), her name is Johanna Oakley and she is no relation of Todd. In the popular musical adaptation by Stephen Sondheim, inspired by Christopher Bond's play Sweeney Todd, the Demon Barber of Fleet Street (1973), she is the daughter of Benjamin Barker and his wife, Lucy. In this version she is the ward of Judge Turpin, the man who falsely convicted her father and raped her mother.