Agios Dimitrios is a village in Karystos Municipality, in the regional unit of Euboea, in the region of Central Greece, Greece. Agios Dimitrios lies in the Euboea mountains, on the island of Euboea. It has 99 inhabitants (2021). The nearest city is Artemida, 41 km to the west. Beaches nearby: Schoinodavleia (3.7 km), Kallianou (4.9 km), Giannitsi (6.7 km). Among the landmarks around are Carystus (10.4 km), Castelo Rosso (8.3 km) and Marmarium (12.5 km). Among the natural features are Mandili islet (20 km) and Tragos islet (17.5 km).
Also written Άγιος Δημήτριος.