| Duke Peter Alexandrovich | |
|---|---|
 Peter of Oldenburg and his wife Olga | |
| Born | 21 November 1868 Oldenburg Palace, Saint Petersburg, Russian Empire |
| Died | 11 March 1924 (aged 55) Antibes, France |
| Spouse | Grand Duchess Olga Alexandrovna of Russia |
| Father | Duke Alexander Petrovich of Oldenburg |
| Mother | Princess Eugenia Maximilianovna of Leuchtenberg |
Duke Peter Alexandrovich of Oldenburg (21 November 1868 – 11 March 1924) was the first husband of Grand Duchess Olga Alexandrovna of Russia, the youngest sister of Tsar Nicholas II.