NCO Group, an international corporationNational Children's Orchestra of Great BritainNet capital outflow, an economic metricNetCDF Operators, softwareNetwork-centric operations, a theory of war in the information ageNon-commissioned officer, a category of military rankNumerically controlled oscillator, a digital signal generatorNuova Camorra Organizzata, a defunct Italian criminal organizationIsocyanate, a functional group of atoms –N=C=OIndian 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 reference
