Quirino, officially the Municipality of Quirino (; ), is a municipality in the province of Ilocos Sur, Philippines. According to the , it has a population of people.
Formerly known as Angaki (also spelled Angkaki in some sources), the municipality was renamed in June 1964 in honor of Elpidio Quirino, an Ilocos Sur native who served as the sixth President of the Philippines.
Quirino is situated from the provincial capital Vigan, and from the country's capital city of Manila.
Quirino is politically subdivided into 9 barangays. Each barangay consists of puroks and some have sitios.
In the 2024 census, Quirino had a population of 9,460. The population density was .
Quirino, belonging to the second congressional district of the province of Ilocos Sur, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code. The mayor, vice mayor, and the councilors are elected directly by the people through an election which is being held every three years.
The Cervantes-Quirino Schools District Office governs all private and public educational institutions within the municipality of Quirino. Also includes the private and public schools situated in Cervantes, Ilocos Sur.