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
See also
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