Dirfi (Greek: Δίρφη, older form Δίρφυς - Dirfys) is a mountain in the central part of the island of Euboea, Greece. At 1,743 m elevation, it is the highest mountain of Euboea. The Dirfi gave its name to the municipal unit Dirfys. Its summit is 4 km west of Stropones, 5 km north of Steni Dirfyos and 28 km northeast of the city of Chalcis. There are forests on the lower slopes while most of the mountain is covered with grassland.