Demetrius is the Latinized form of the Ancient Greek male given name Dēmḗtrios (Δημήτριος), meaning "devoted to goddess Demeter".

Alternate forms include Demetrios, Dimitrios, Dimitris, Dmytro, Dimitri, Dimitrie, Dimitar, Dumitru, Demitri, Dhimitër, and Dimitrije,[1][2] in addition to other forms (such as Russian Dmitry) descended from it.

Nicknames include Demmie, Dimmie, Demi, Jim, Jimmy, Jimmie, Metry, Metrie, Mimmie, Demetri, Dimitri, Mitică, Mitya and Dima.

Demetrius and its variations may refer to the following: