Alicia (formerly known as Angadanan Viejo) is a 1st class municipality in the province of Isabela, Philippines. According to the 2015 census, it has a population of 71,504 people.

The town is located in an area of predominantly flat and fertile land in the Cagayan Valley that surrounded by the Caraballo Mountains to the south, the Great Sierra Madre to the east and the Cordillera Mountain Range to the west. It is the largest rice producer in the entire Cagayan Valley and has the largest irrigated rice field in the whole Region II of the Philippines.

Alicia, the old town of Angadanan, is known for the Pagay Festival and its famous historical landmark, the Church completed and inaugurated in 1849 which was officially declared by the Philippine Department of Tourism as a national religious tourist destination in the Philippines.

Alicia has a total land area of 15, 410 hectares and 64, 339 total population as of 2009. 71% of the total land area is an agricultural land which makes Alicia primarily an agricultural municipality best suited for the intensive production of rice and corn. Farming is its major livelihood and rice its major product and resource.

Alicia is politically subdivided into 34 barangays:

Alicia was once called "Angadanan Viejo" (which means "Old Angadanan") when the new Angadanan was relocated in 1776 to its current location near the Angadanan Creek.

The old Angadanan town was part of the Cagayan Valley province. The entire Cagayan Valley was one large province which the Spaniards called La Provincia del Valle de Cagayan, but divided into two new provinces in 1839 by the Spanish conquistadors. One retained the old name Cagayan which comprised all towns from Aparri to Tumauini; while a new province of Nueva Vizcaya was created composed of all towns from Ilagan City to the Caraballo del Sur including Catalangan, Angadanan (now Alicia), and Palanan, with Camarag (Echague) as its capital.

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