Lagonoy Gulf is a large gulf in the Bicol Peninsula of Luzon island in the Philippines. It is separated from the Philippine Sea by the Caramoan Peninsula in the north; and is separated from Albay Gulf in the south by a chain of islands including Batan Island and Rapu-rapu Island. It is about in area, with 80% of its area between and deep.
The gulf is home to 480 fish species, and annual fishery production in 2004 amounted to some 20,000 MT, making Lagonoy Gulf a major fishing ground in the Philippines. Coral reefs, seaweed/seagrass beds, and mangroves form the critical habitats for gulf's ecology.