Aparri is a first class municipality in the province of Cagayan, Luzon, Philippines. It sits at the mouth of the Cagayan River, the longest river in the Philippines, about 55 miles north of Tuguegarao, the provincial capital. According to the 2010 census, Aparri has a population of 61,199 people.
Aparri has an approximate income of ₱90 million. The valley is one of the largest tobacco-producing sections in the Philippines, and the town has a considerable coastwise trade.
It has a meteorological station located in Barangay Punta where the Cagayan River meets the Babuyan Channel.
It also administers Fuga Island, which is part of the Babuyan Group and is much closer to Claveria.