The Mariano Marcos State University, also referred to by its acronym MMSU, is a higher education institution with campuses and facilities throughout Ilocos Norte province in the Philippines. Its main campus is in Batac.

Batac, officially the City of Batac, is a 5th class component city in the province of Ilocos Norte, Philippines. According to the 2020 census, it has a population of 55,484 people.