SIFS
| Acronym | Definition |
|---|---|
| SIFS | Short Inter Frame Space |
| SIFS | Short Inter-Frame Space |
| SIFS | Southern Illinois Flute Society (est. 1996) |
| SIFS | Standard Industrial Fund System |
| SIFS | Supply Interface System |
| SIFS | Southern Institute of Forensic Science (est. 1988; Louisiana and Colorado) |
| SIFS | Single Integral Finite Strain |