Calapan City is a 2nd class component city in the Fist Congressional District in the province of Oriental Mindoro, Philippines and serves as the provincial capital. It is known most distinctly as the "Gateway to the Golden Isle" but is also referred to with other different titles such as "The Discipline City", "The City of the Golden Grains", "The Acropolis of the South", and "The Provincial Capitol" . According to the 2010 LGPMS Census, it has a population of 116,976 people in 20,929 households. Its citizens are called Calapeños.

The city's economy is dependent on agriculture and fishing. However, a growing industry in machinery and tourism has contributed well to the city's annual income making it one of the fastest growing new cities in the country for the last 10 years. Calapan City also serves as the gateway to the Oriental Mindoro province with the implementation of the Strong Republic Nautical Highway, an integrated Roll On-Roll Off project of President Gloria Macapagal Arroyo that extends further to the southern part of the Philippines. The Calapan City Seaport is the largest and busiest seaport in the Mindoro island with ships that travels to and from the Batangas City International Seaport. Calapan City is 45 minutes away from Batangas City and is accessible by ferry boat and RORO ships.