Encyclopædia Britannica, Ninth Edition/Demetrius

In the 9th edition of the Encyclopædia Britannica, Demetrius may refer to:


 * , king of Macedonia,
 * , king of Macedonia,
 * , king of Hellenic Syria,
 * , king of Hellenic Syria,
 * , king of Hellenic Syria,
 * , a Peripatetic philosopher,
 * , a Cynic philosopher, or
 * , a Russian pretender.