Carlo Alberto Cardinal Guidoboni Cavalchini (1683–1774) was an Italian Cardinal. Considered papabile in the Papal conclave, 1758, he was vetoed by Louis XV of France under the jus exclusivae. A lawyer by education, he became titular archbishop of Filippi in 1728, and was created Cardinal in 1743. He became bishop of Albano in 1759 and bishop of Ostia in 1763. Dean of the College of Cardinals 1763-74.