SFG may refer to:
Military
- Special Forces Group (Belgium)
- Special Forces Group (Japan)
- Special Forces (United States Army)#Special Forces groups
Science and Technology
- Sum-frequency generation in optical physics
- Signal-flow graph
- Superior frontal gyrus, in the human brain
- Systemic functional grammar
Other
- San Francisco Giants, a Major League Baseball team
- L'Espérance Airport, IATA airport code
- Scouting for Girls, English pop rock band
- "Super Freaky Girl", 2022 single by Nicki Minaj; widely abbreviated to "SFG" by fans
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