San Mateo, officially the Municipality of San Mateo, (Tagalog: Bayan ng San Mateo), is a 1st class municipality in the province of Rizal, Philippines.
According to the 2015 census, it has a population of 579,925. Bordered by Quezon City to the west, cities of Marikina and Antipolo to the south, and to the north by the municipality of Rodriguez.