NOS
NOS is a three-letter acronym with multiple meanings. It may refer to: == Science and technology ==- [[Nitric oxide synthase]]
- [[Nitrous oxide system]]
- [[Network operating system]]
- [[Not otherwise specified]]
- [[Nederlandse Omroep Stichting]]
- [[National Ocean Service]]
- [[National Occupational Standards]]
- [[Nos (band)]]
- [[N.O.S. (rapper)]]
- [[The Nose (opera)]]
- [[New old stock]]
- [[Numbers]]