Pinabacdao, officially the Municipality of Pinabacdao, is a 4th class municipality in the province of Samar, Philippines. According to the 2020 census, it has a population of 18,136 people.

Samar, officially the Province of Samar, formerly named Western Samar, is a province in the Philippines located in the Eastern Visayas region. Its capital is the city of Catbalogan. It is bordered by Northern Samar, Eastern Samar, Leyte and Leyte Gulf, and includes several islands in the Samar Sea. Samar is connected to the island of Leyte via the San Juanico Bridge.