Marmari (Greek: Μαρμάρι, Katharevousa: Μαρμάριον) is a village and a former municipality in Euboea, Greece, in the southeastern end of the island.

[3] The Greek National Road 44 (Chalkida - Karystos) runs through it and there are ferry routes with the mainland port of Rafina.

Marmari is located southeast of Chalkida, east of Rafina and west of Karystos.

Sights of the area are: Saint George church and chrissi ammos (golden sand) beach.

National Geographic magazine ranks Marmari between the top 10 best sailing destinations.