William Joseph Levada (born June 15, 1936) is an American Cardinal of the Roman Catholic Church. He currently serves as Prefect of the Congregation for the Doctrine of the Faith in the Roman Curia, previously serving as Archbishop of Portland (Oregon) from 1986 to 1995 and Archbishop of San Francisco from 1995 to 2005. Levada was elevated to the cardinalate in 2006.