NNC can stand for:
- Norwegian Nobel Committee
- Nobel Night Cap
- Natal Native Contingent
- National Nutrition Council (Philippines)
- Naga National Council, a predecessor of the Nationalist Socialist Council of Nagaland
- National Negro Congress
- National Numismatic Collection, a part of the National Museum of American History
- Northwest Nazarene College, now called Northwest Nazarene University
- National Nuclear Corporation (later officially just NNC), a company formed by the merger of companies that built the UK's nuclear power stations; bought by AMEC in 2005