Marmari (, Katharevousa: Μαρμάριον) is a village and a former municipality in Euboea, Greece, in the southeastern end of the island. Since the 2011 local government reform it is part of the municipality Karystos, of which it is a municipal unit. The Greek National Road 44 (Chalkida - Karystos) runs through Marmari. There are ferry routes with the mainland port of Rafina. The mountains dominate the east. Its main economy are businesses and agriculture. Marmari is located SE of Chalkida, E of Rafina and west of Karystos.

Marmari (, Katharevousa: Μαρμάριον) is a village and a former municipality in Euboea, Greece, in the southeastern end of the island. Since the 2011 local government reform it is part of the municipality Karystos, of which it is a municipal unit. The Greek National Road 44 (Chalkida - Karystos) runs through Marmari. There are ferry routes with the mainland port of Rafina. The mountains dominate the east. Its main economy are businesses and agriculture. Marmari is located SE of Chalkida, E of Rafina and west of Karystos.