NPO may refer to:

• Nil per os, Latin for 'nothing by mouth', a medical instruction to withhold oral intake of food and fluids
• neurogenic pulmonary oedema

• North Pacific Oscillation, a teleconnection pattern in atmospheric conditions over the North Pacific
• NP optimization problem, an optimization problem that is NP-hard
• NPO, characterizing thermal stability of a capacitor
• The NPO complexity class, standing for "NP-optimization problem", in computational complexity

• Nonprofit organization
• National Portfolio Organisation, a UK-based culture and arts organisation receiving substantial funding from Arts Council England
• National Ports Organisation, former part of the UK Department for Transport
• National Preservation Office, part of the British Library
• Scientific Production Association (Nauchno-Proizvodstvennoye Obyedineniye, Научно-производственное объединение), a form of scientific research-to-production facility in the Soviet Union and the Russian Federation.
• Nederlandse Publieke Omroep ('Netherlands Public Broadcasting'), governing body of the Netherlands (Dutch) Public Broadcasting System
• Nederlands Publieke Omroepbestel ('Dutch public broadcasting system'), the public broadcasting service in the Netherlands
• Netherlands Pathfinder Organisation (Nederlandse Padvinders Organisatie), one of the organisations that evolved into Scouting Nederland, the national Scouting organisation
• NPO UK Ltd., a chain of stationery and book shops in Northern Ireland, now part of Eason & Son
• National Printing Office, one of the three recognized government printers of the Philippines
• National Parents Organization, non-profit charitable and educational organization in the United States that promotes shared parenting.

• Nanga Pinoh Airport, Indonesia (IATA code)
• Pochuri language, of Nagaland, India (ISO 639 code)

This disambiguation page lists articles associated with the title NPO.
If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.