Euboea (Greek: Περιφερειακή ενότητα Εύβοιας) is one of the regional units of Greece.

It consists of the islands of Euboea and Skyros, as well as a 260 km2 area on the Greek mainland.

Its land area is 4,167.449 km2, whereas the total land area of the municipalities actually on the island Euboea is 3,684.848 km2, which includes that of numerous small offshore islets (Petalies Islands) near Euboea's southern tip.

The Euboea regional unit is subdivided into 8 municipalities, numbered in the picture in the infobox.

[2] Note: the former municipalities of Anthidona and Avlida are on the mainland, attached to the northeastern part of Boeotia.