Terzorio (Ligurian: O Tersö[3]) is a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about 100 kilometres (62 mi) southwest of Genoa and about 11 kilometres (7 mi) southwest of Imperia.

The municipality has an area of 1.9 square kilometres (0.73 sq mi).

Terzorio borders the following municipalities: Cipressa, Pompeiana, and Santo Stefano al Mare.

As of 31 December 2004, Terzorio had a population of 208.

This Liguria location article is a stub.