Demetrios I.
Demetrios I. is the name of the following people:
- Demetrios I. Poliorketes (around 336 BC – 283 BC), Macedonian general and ruler of the Diadochi
- Demetrios I (Bactria) († 182 BC / 175 BC), King of the Bactrian Empire
- Demetrios I (Soter) († 150 BC), King of the Seleucid Empire