Alexander I
Alexander I may refer to:
- Alexander I of Macedon, king of Macedon from 495 to 454 BC
- Alexander I of Epirus, king of Epirus
- Alexander I Theopator Euergetes, surnamed Balas, ruler of the Seleucid Empire 150-145 BC
- Pope Alexander I, early bishop of Rome
- Pope Alexander I of Alexandria, patriarch of Alexandria
- Alexander I of Scotland, king of Scotland
- Aleksandr Mikhailovich of Tver, prince of Tver as Alexander I
- Alexander I of Georgia, king of Georgia
- Alexander I of Moldavia, prince of Moldavia
- Alexander I of Kakheti, king of Kakheti
- Alexander Jagiellon, king of Poland
- Alexander I of Russia, emperor of Russia
- Alexander of Battenberg, prince of Bulgaria
- Alexander I of Serbia, king of Serbia
- Alexander I of Yugoslavia, king of Yugoslavia
- Alexander of Greece, king of Greece