Istiaia-Aidipsos (Greek: Ιστιαία-Αιδηψός) is a municipality in the Euboea regional unit, the Central region of Greece. The seat of the municipality is the town Istiaia. The municipality has an area of 509.204 km.

Municipality

The municipality Istiaia-Aidipsos was formed at the 2011 local government reform by the merger of the following 5 former municipalities, that became municipal units:

• Aidipsos
• Artemisio
• Istiaia
• Lichada
• Oreoi

Province

The province of Istiaia (Greek: Επαρχία Ιστιαίας) was one of the provinces of the Euboea Prefecture. It had the same territory as the present municipality Istiaia-Aidipsos. It was abolished in 2006.