SGN can refer to:
- SGN (company), a gas distribution company operating in Scotland and southern England
- The airport code for Tan Son Nhat International Airport, Ho Chi Minh City, Vietnam
- The National Rail station code for South Greenford railway station, London, England
- Sélection de Grains Nobles, a French term for sweet wines made from grapes affected by noble rot
- Some Good News, a YouTube series
- Samsung Galaxy Note, a series of mobile phones
- Seattle Gay News, owner of the sgn.org domain
In mathematics
- sgn(x), the sign function
- sgn(σ), the signature of a permutation
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