NOS may refer to:

Look up NOS or nos in Wiktionary, the free dictionary.

• Nitrous oxide, also known as nos or laughing gas
• Nitric oxide synthase, a class of enzymes
• Nitrous oxide system, an internal combustion engine
• Not Otherwise Specified, a categorization of illnesses
• Network operating system, a type of software
• NOS (operating system), a CDC network operating system
• KA9Q NOS, a TCP/IP implementation
• NOS stereo technique, for audio recording

• National Ocean Service, US
• National Office of Statistics, Algeria
• National Orthodox School, Amman, Jordan
• Nederlandse Omroep Stichting, a Dutch public broadcasting corporation
• New Orleans Saints, an American football team
• Nitrous Oxide Systems, a subdivision of Holley Performance Products, an American automotive company
• NOS (Portuguese company)
• NOS, the ICAO designator of the now-defunct Norwegian airline, Norway Airlines
• NOS, the ICAO designator of the Italian airline Neos

• Nos, an opera by Shostakovich
• N.O.S, part of the French rap duo PNL

• National Occupational Standards, UK
• National Orange Show, San Bernardino, California, US
• New Old Stock, unused old merchandise
• NOS (drink), named after Nitrous Oxide Systems
• Nos, Book of the Resurrection, a book by Miguel Serrano
• Nos. or nos., the numero sign, an abbreviation of "numbers"
• Fascene Airport, Nosy Be, Madagascar (IATA code)

• Nós
• Noss (disambiguation)
• All pages with titles beginning with NOS
• All pages with titles containing NOS

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