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
 
See also
- Patriarch Dimitrije, Serbian Patriarch in 1920–1930
 
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