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

• Patriarch Dimitrije, Serbian Patriarch in 1920–1930

Topics referred to by the same term

This disambiguation page lists articles about people with the same name.
If an internal link led you here, you may wish to change the link to point directly to the intended article.