Sebaste, officially the Municipality of Sebaste (; ; ), is a municipality in the province of Antique, Philippines. According to the , it has a population of people.
Sebaste is located at . It is from the provincial capital, San Jose de Buenavista, and is from Kalibo, the capital of Aklan.
According to the Philippine Statistics Authority, the municipality has a land area of constituting of the total area of Antique.
Sebaste is politically subdivided into 10 barangays. Each barangay consists of puroks and some have sitios.
In the 2024 census, Sebaste had a population of 19,365 people. The population density was .
Kinaray-a is the dominant language of Sebaste while Hiligaynon is used as a secondary language.
Every February 3, the people of Sebaste celebrate the annual feast of their patron saint.
The Sebaste Schools District Office governs all educational institutions within the municipality. It oversees the management and operations of all private and public, from primary to secondary schools.
The municipality has 1 private high school (Saint Blaise High School) and 1 public high school (Sebaste High School/Sebaste National High School).