SFG
# SFG

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
