NACC
- National Anti-Corruption Commission (Australia)
- National Anti-Corruption Commission (Saudi Arabia)
- National Anti-Corruption Commission (Thailand)
- National Association for Colitis and Crohn's Disease
- National Association of Catholic Chaplains
- National Automobile Chamber of Commerce
- National assessment on climate change
- North American Christian Convention
- North American College and Community Radio Chart
- North American Competitiveness Council
- North Atlantic Cooperation Council
- Northeast Alabama Community College
- Northern Athletics Collegiate Conference
- Nucleus accumbens