Santiago, officially the City of Santiago, is a 1st class independent component city in the Cagayan Valley region of the Philippines. According to the 2020 census, it has a population of 148,580 people.

A city is one of the units of local government in the Philippines. All Philippine cities are chartered cities, whose existence as corporate and administrative entities is governed by their own specific municipal charters in addition to the Local Government Code of 1991, which specifies their administrative structure and powers. As of July 8, 2023, there are 149 cities.