Oreoi is a village and a former municipality in Euboea, Greece. It was named after the ancient town Oreus. Since the 2011 local government reform it is part of the municipality Istiaia-Aidipsos, of which it is a municipal unit. Population 3,392 (2001). It is situated on the northwest coast of the island Euboea, by the Oreoi Strait that connects the Aegean Sea with the North Euboean Gulf. The small port Agiokampos, 5 km west of Oreoi, is served by ferries to Glyfa on the mainland.

Oreoi is a village and a former municipality in Euboea, Greece. It was named after the ancient town Oreus. Since the 2011 local government reform it is part of the municipality Istiaia-Aidipsos, of which it is a municipal unit. Population 3,392 (2001). It is situated on the northwest coast of the island Euboea, by the Oreoi Strait that connects the Aegean Sea with the North Euboean Gulf. The small port Agiokampos, 5 km west of Oreoi, is served by ferries to Glyfa on the mainland.