Nicaragua's IOC country code.

National College of Arts in Lahore, Pakistan.

Network Computing Architecture, an Oracle Forms technology.

Norwegian Church Aid, a Norwegian charity.

NCA is a three-letter acronym, which may refer to the:

National Cricket Academy, a cricket academy based in India.

Noise Control Act, a U.S. law more formally known as the Noise Pollution and Abatement Act of 1972.

Nuevo Central Argentino, an Argentine railway company.

National Communication Association, an American organisation which works to promote the academic discipline of Communication Studies.

National Computerization Agency, a statutory agency for the purpose of promoting informatization and to support development of related policies for Korean national agencies and local autonomies.

National Cycling Association, a former sports governing body in Ireland.

National Command Authority, a United States military term for the combined authority of the President and the Secretary of Defense.

North Central Association of Colleges and Universities, one of six organizations that provide higher learning accreditation in the United States.

National Crime Authority, former Australian criminal investigative agency.

National Campaign for the Arts, a lobbying group for the arts in the United Kingdom.

Network Console on Acid, allows remotely connected administrators to read and write directly to the console.

National Capital Authority, a government authority involved in development planning for the Australian Capital Territory.

National Conservation Area, a protected area managed by the United States Bureau of Land Management.

Nuclear Command Authority, a government body with authority over the deployment of India's nuclear weapons stockpile.

Nexus Computing Agents, trusted software programs in Microsoft's delayed NGSCB initiative.

Nippon Cargo Airlines, a cargo airline of Japan. NCA is its ICAO code.

Nortel Certified Architect (NCA), the highest Nortel Certifications.