Terzorio is a comune, or municipality, located in the Province of Imperia within the Italian region of Liguria. It is situated approximately 100 kilometres southwest of Genoa and about 11 kilometres southwest of the city of Imperia.
The municipality covers a total area of 1.9 square kilometres. It serves as a small administrative division in the coastal province, characterized by its proximity to the major regional hubs of Liguria.