NCO

NCO may refer to:


 * NCO Group, an international corporation
 * National Children's Orchestra of Great Britain
 * Net capital outflow, an economic metric
 * NetCDF Operators, software
 * Network-centric operations, a theory of war in the information age
 * Non-commissioned officer, a category of military rank
 * Numerically controlled oscillator, a digital signal generator
 * Nuova Camorra Organizzata, a defunct Italian criminal organization
 * Isocyanate, a functional group of atoms –N=C=O
 * Indian National Congress (Organisation), a former Political Party in India formally referred as NCO by the Election Commission of India.
 * Nevada–California–Oregon Railway, a defunct railway in the western United States