Aparri is a 2nd class municipality in the province of Cagayan, Luzon, Philippines. Aparri sits at the mouth of the Cagayan River, the longest river in the country, about 55 miles north of Tuguegarao, the capital. According to the 2000 census, Aparri has a population of 59,046 people in 11,019 households.
The valley is one of the largest tobacco-producing sections in the Philippines; and the town has a considerable coastwise trade. Here, too, is a meteorological station.
Aparri was a Japanese trading post established on the northern tip of Luzon sometime after 1400.
In 2006, work was started to build a port, after the old pier deteriorated due to the rising level of water, the common storms, and poor construction (ruins of it are now seen washed up on the beach). It is expected to be a 1st class municipality after the work is done.