CALBAYOG, a municipality (with administration centre and 31 barrios or districts) of the province and island of Samar, Philippine Islands, on the west coast at the mouth of the Cal bayog river, about 3o m. north-west of Catbalogan, the pro vincial capital. Pop. (1918) 25,38o, of vihom only 28 were whites. Considerable abaci is exported to Manila, and copra is produced in quantity in the region. Some fine timbers are found nearby. Hot springs are located in the neighbourhood. The climate is very warm. A meteorological station has been established here. In 1928 it had 28 manufacturing establishments with output valued at 173,300 pesos and 18o household industry establish ments with output valued at 60,400 pesos. Its eight schools are all public. The language spoken is a dialect of Bisayan.