Matnog, officially the Municipality of Matnog (Waray Sorsogon: Bungto san Matnog; Waray: Bungto han Matnog, Tagalog: Bayan ng Matnog), is a 3rd class municipality in the province of Sorsogon, Philippines and is the southernmost part of Luzon. According to the 2020 census, it has a population of 41,989 people.