North American Competitiveness Council, an official tri-national working group of the Security and Prosperity Partnership of North America

North American Choral Company, a choir based out of Grand Rapids, Michigan, USA

Nucleus accumbens, a brain region

National Assessment on Climate Change, a massive multidisciplinary effort to study and portray the potential effects of human-induced global warming on the United States

North American Christian Convention, an annual meeting of ministers and other active leaders in the Independent Christian Churches/Churches of Christ

North Atlantic Cooperation Council, the precursor to the Euro-Atlantic Partnership Council