Aqua Claudia, was an ancient Roman aqueduct that, like the Anio Novus, was begun by Emperor Caligula in 38 AD and finished by Emperor Claudius in 52 AD.
Together with Aqua Anio Vetus, Aqua Anio Novus, and Aqua Marcia, it is regarded as one of the "four great aqueducts of Rome".