NCO may refer to:

• NAFTA certificate of origin, a customs document for certificate of origin
• NCO Group, an international corporation that provides customer service contracting
• Net Capital Outflow, an economic metric measuring the amount of money from a country holding assets elsewhere
• NetCDF Operators, a suite of programs for manipulating NetCDF files
• Network-centric operations, an emerging theory of war in the information age
• Non-commissioned officer in the rank structure of many armed forces worldwide
• Numerically-controlled oscillator, a clock divider for microprocessors
• Nuova Camorra Organizzata, an Italian Camorra criminal organization

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