Demetrius I
# Demetrius I

Demetrius I may refer to:

* Demetrius I of Macedon (337–283 BC), king of Macedon
* Demetrius I of Bactria, Greco-Bactrian king (reigned c. 200–180 BC)
* Demetrius I Soter (born 185 BC, reign 161–150 BC), ruler of the Hellenistic Seleucid Empire
* Pope Demetrius I of Alexandria, ruled in 189–232
* Demetrius Zvonimir of Croatia (died 1089), King of Croatia
* Demetrius I of Georgia (c. 1093–1156), Georgian king
* Demetrius I Starshy (died 1399), Duke of Bryansk
* Demetrius I Qadi (1861–1925), Patriarch of the Melkite Greek Catholic Church
* Patriarch Demetrius I of Constantinople (1914–1991), Ecumenical Patriarch of Constantinople
