Paulus Perusinus or Pusinus was an Italian mythographer of the 14th century.
He was Head Librarian at the service of King Robert of Sicily and Jerusalem (Robert the Wise), a thorough investigator on foreign books and a close friend of Barlaam of Seminara, Boccaccio's own master.
He attributes Paul an extensive treatise entitled Collections which was lost after his death.
Boccaccio praises Paul's work, particularly when he quotes a certain Theodontius.
Giovanni Boccaccio, Genealogia Deorum Gentilium (Venice, 1472), Book XVI, chapter VI.