Peter of Oldenburg

• Peter I, [Grand Duke of Oldenburg], Regent of the Duchy of Oldenburg
• Peter II, [Grand Duke of Oldenburg], Grand Duke of Oldenburg
• Duke Peter Georgievich of Oldenburg, Duke of the House of Oldenburg
• Duke Peter Alexandrovich of Oldenburg, first husband of Grand Duchess Olga Alexandrovna of Russia
• Peter Friedrich Wilhelm, Duke of Oldenburg, Duke of Oldenburg