Pinabacdao, officially the Municipality of Pinabacdao (Waray: Bungto han Pinabacdao; Cebuano: Lungsod sa Pinabacdao; Filipino: Bayan ng Pinabacdao) is a 4th class municipality in the province of Samar, Philippines. According to the 2015 census, it has a population of 18,252 people.

It lies at the south-west central coast of Samar Island and crossed along by the Pan-Philippine Highway. Pinabacdao is bordered to the north by the municipality of Calbiga; to the east by the capital city of Borongan in the province of Eastern Samar; to the west by the municipality of Villareal and Villareal Bay; and to the south by the municipalities of Santa Rita and Basey.

It is considered as the center of rice production in the province of Samar. The home of Mayaw-Mayaw Festival, an ethnic and dance festival celebrated every May 10 of each year. Mayaw-Mayaw Festival won second runner-up in the festival dance competition and first prize winner in the float design competition during the 2015 Aliwan Fiesta which was held on April 23–25 in the cities of Manila and Pasay.

The term "Pinabácdao" or "Pinabakdaw" is a Waray Sinamar-Lineyte dialect that means "asked to stand" in English Language or simply "pinatayó" in Filipino Language. But in the book Atlas de Filipinas by José María Algué, SJ - a Spanish-Roman Catholic priest and meteorologist in the observatory of Manila published in 1899 (In 1900 published in English: Atlas of the Philippine Islands by the U.S. Coast and Geodetic Survey now U.S. National Geodetic Survey); Pinabacdao was cited as Pinabágdao and listed as a pueblo or town in the former island province of Samar.

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