Peter III

Peter III may refer to:

Politics

 * Peter III of Bulgaria (ruled in 1072)
 * Peter III of Aragon (1239–1285)
 * Peter III of Arborea (died 1347)
 * Peter III Aaron (died 1467)
 * Pedro III of Kongo (ruler in 1669)
 * Peter III of Russia (1728–1762)
 * Peter III of Portugal (1717–1786)
 * Peter III (cat) (1947-1964)

Religion

 * Pope Peter III of Alexandria (477–489)
 * Peter III of Raqqa, Syriac Orthodox Patriarch of Antioch in 581–591
 * Peter III of Antioch Greek Orthodox Patriarch of Antioch
 * Peter III (bishop of Lugo) (r. from 1113 until 1133)
 * Peter III, Pope Peter III of the schismatic Palmarian Catholic Church