SFG is a three-letter abbreviation that may refer to:
- Single Figure Golfer, a community for golfers with a handicap of under 10
- Systemic functional grammar, a concept in linguistics
- Stanford Financial Group, a financial services company accused of fraud
- The IATA airport code for L'Espérance Airport
- Sum-frequency generation, a phenomenon in optical physics
- San Francisco Giants, a baseball team in Major League Baseball
- Scouting for Girls, a British indie pop band.
- Special Forces Group (Belgium)
- Special Forces Group (Japan)
- Individual groups within the Special Forces (United States Army)
- Square foot gardening, the practice of planning and creating small but intensively planted gardens.