CNC or cnc may refer to:

• Cadet Nurse Corps, an American World War II program to train nurses
• Civil Nuclear Constabulary, a United Kingdom police force responsible for providing security at civil nuclear installations
• Cantabrian Nationalist Council, a political party in the Spanish province of Cantabria with a nationalist and left-wing ideology
• Chariton Municipal Airport, which has the IATA code "CNC", an airport Chariton, Iowa
• Currently Non Collectable, a condition where the United States Internal Revenue Service determines a taxpayer has insufficient assets to be able to collect back taxes and penalties from them.

Numerical control (NC) is the automation of machine tools that are operated by precisely programmed commands encoded on a storage medium, as opposed to controlled manually by hand wheels or levers, or mechanically automated by cams alone. Most NC today is computer (or computerized) numerical control (CNC), in which computers play an integral part of the control.