John the Deacon (c.940–c.1018; also Giovanni da Venezia, Giovanni Diacono, Iohannes Diaconus or Iohannes Venetus) was a Venetian chronicler and secretary to doge Pietro Orseolo II.
The Chronicon Altinate contains an apocryphal account of how duke Paulicius was killed in a factional fight between people from Equilo and Heraclia.