Suyo, officially the Municipality of Suyo (; ), is a municipality in the province of Ilocos Sur, Philippines. According to the , it has a population of people.
Suyo is situated from the provincial capital Vigan, and from the country's capital city of Manila.
Suyo is politically subdivided into 8 barangays. Each barangay consists of puroks and some have sitios.
In the 2024 census, Suyo had a population of 11,051 people. The population density was .
Suyo is part of the second congressional district of the province of Ilocos Sur. It 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 Suyo Schools District Office governs all private and public educational institutions within the municipality. It oversees the operations of the education system.