Peter the Deacon (disambiguation)

Peter the Deacon was the librarian of the abbey of Montecassino and continuator of the Chronicon Monasterii Casinensis.

Peter the Deacon or Petrus Diaconus may also refer to:

• Peter the Deacon (died c. 605), a disciple and friend of Gregory the Great
• Peter the Deacon (chronicler), another monk of Monte Cassino, also called "the Librarian" (Bibliothecarius), b. c. 1107 at Rome; d. probably c. 1140