SG1 commonly refers to Stargate SG-1, a television show.
SG1 may also refer to:
- SG1 (or SG/1), a version of the Heckler & Koch G3 rifle
- SG1, a minor planet notation indicating the thirty-third discovery in late September of a given year, see Provisional designation in astronomy#SG1
- Scanlan SG-1, glider
- the SG1 postcode district in the SG postcode area, in Stevenage in the United Kingdom
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