Peter IV

Peter IV may refer to:


 * Pope Peter IV of Alexandria (ruled 565–569)
 * Patriarch Peter IV of Alexandria (ruled 643–651)
 * Peter IV of Ravenna (927–971)
 * Peter IV of Bulgaria (ruled 1185–1197)
 * Peter IV of Aragon (1319–1387)
 * Peter IV of Portugal (I of Brazil) (1798–1834)
 * Ignatius Peter IV, Syriac Orthodox Patriarch of Antioch in 1872–1894