TNO

TNO may refer to:


 * Franco-Ténois, the widespread community of francophones who reside in the Northwest Territories
 * Netherlands Organisation for Applied Scientific Research, an independent research organization in the Netherlands
 * Tamarindo Airport (IATA code: TNO), a private airport that serves Tamarindo, Costa Rica
 * , a French thermonuclear warhead
 * Thai National Observatory, part of the National Astronomical Research Institute of Thailand
 * TNO intestinal model, systems mimicking the digestive tract
 * Trans-Neptunian object, any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune
 * Texas and New Orleans Railroad, a railroad in Texas and Louisiana. Was bought by Southern Pacific in 1881, and merged with Southern Pacific in 1961.