John the Deacon (Johannes Diaconus or Giovanni Diacono) may refer to:
John the Deacon (6th century), letter writer from Rome John the Deacon (Egyptian chronicler), ca. 768, monk Johannes Hymonides, d. before 882, known as John the Deacon of Rome John the Deacon (Neapolitan historian), d. after 910 John the Deacon (Venetian chronicler), d. after 1008 John the Deacon (Byzantine writer), fl. 11th century; On the veneration of saints. John the Deacon of the Lateran, fl. 12th century
See also John Deacon (disambiguation)