Alicia is a first-class municipality in the province of Isabela, Philippines (Ilocano: Ili ti Alicia; Tagalog: Bayan ng Alicia; formerly known as Angadanan Viejo). It has 73,874 residents, according to the 2020 census.

The Caraballo Mountains to the south, the Great Sierra Madre to the east, and the Cordillera Mountain Range to the west surround the municipality, which is situated in a region of mostly flat and fertile territory in the Cagayan Valley. It has the largest irrigated rice field in all of Region II of the Philippines and is the largest producer of rice in the entire Cagayan Valley.

The Our Lady of Atocha Church, which was built and inaugurated in 1849, is a famous historical landmark in Alicia, the old town of Angadanan, and has been designated by the Philippine Department of Tourism as a national religious tourist destination in the country.