National Academy of Customs Excise & Narcotics or NACEN is the apex institute of Government of India for capacity building in the field of indirect taxation. It also plays a vital role in international capacity building by imparting training to officers of various countries in the field of customs, drug laws and environment protection. NACEN is the World Customs Organisation (WCO) Regional Training Centre (RTC) for Asia Pacific. United Nations Environment Program (UNEP) has designated NACEN as a collaboration centre for capacity building in the field of environment protection. In collaboration with United Nations Office on Drugs & Crime (UNODC), NACEN is imparting training on drug law enforcement to various Asian nations. The Government of India has entrusted NACEN the responsibility of knowledge exchange, experience sharing and training with various countries of the world.

Over the years, NACEN has been successfully conducting profession training of the officers of Indian Revenue Service (Customs & Central Excise). It has been imparting in-service training to the officers of Government of India across several departments in the field of Customs, Central Excise, Service Tax, Drug Laws, Anti-Money laundering, Weapons of Mass Destruction, Fake Indian Currency Notes, Ozone Depleting Substance (ODS), Intellectual Property Right (IPR) etc.