Jacobus Balduinus (died 1225) was an Italian jurist
He was born in Bologna, and is reputed to have been of a noble family. He was a pupil of Azo, and the master of Odofredus, of the canonist Hostiensis (Henricus de Segusio), and of Jacobus de Ravanis (Jacques de Revigny), who taught at Orléans. His great fame as a professor of civil law at the University of Bologna caused Balduinus to be elected podestà of the city of Genoa, where he was entrusted with the reforms of the law of the Genoese republic. He died at Bologna in 1225, and has left behind him some treatises on procedure.