Bayog, officially the Municipality of Bayog (Cebuano: Lungsod sa Bayog; Subanen: Benwa Bayog; Chavacano: Municipalidad de Bayog; Tagalog: Bayan ng Bayog), is a 3rd class municipality in the province of Zamboanga del Sur, Philippines. According to the 2020 census, it has a population of 34,519 people.