NOS

NOS may refer to:

Business

• National Occupational Standards, standards of work performance people are expected to achieve
• New old stock, merchandise being offered for sale which was manufactured long ago but that has never been used

Geography

• NOS, IATA code for Fascene Airport, in Nosy Be, Madagascar
• New Orleans Square, a themed "land" at Disneyland in Anaheim, California

Information Technology

• Network operating system, a kind of computer software for running local area networks
• Nokia OS, operating system software for Nokia mobile telephones
• NOS (software), the primary operating system for the Control Data Corporation Cyber line of mainframe computers

Science

• Nitric oxide synthase, a class of enzyme
• National Ocean Service, part of the National Oceanic and Atmospheric Administration
• Neotropical Ornithological Society

Miscellaneous

• National Open School, former name for the National Institute of Open Schooling
• Nature Of Science, a phrase commonly used in science education and science studies
• Nederlandse Omroep Stichting, a Dutch broadcaster
• New Orleans Saints, an American football team
• Nine O'Clock Service, an alternative worship service in the 1980s in Sheffield, England.
• Nitrous Oxide Systems, a manufacturer of nitrous systems for high-performance automobiles
• Nos, Book of the Resurrection, a book by Miguel Serrano (original title: Nos: Libro de la Resurrección)
• NOS (drink), a beverage named after Nitrous Oxide Systems
• Not Otherwise Specified, a sub-category frequently used in systems of disease classification such as ICD-10

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