| Abbreviation | Definition |
|---|---|
| FSI | Forward Slope Inc |
| FSI | Foundation Services, Incorporated |
| FSI | Foundation Systems Inc |
| FSI | Free Space Interiors |
| FSI | Frozen Specialties Inc |
| FSi | Fucshit inc |
| FSI | Fultz and Son Inc |
| FSI | Funeral Services Inc |
| FSIC | Florida Specialty Insurance Company |
| FSIP | Flight Systems Industrial Products |
| FSL | Firstsource Solutions Ltd |
| FSL | Freescale Semiconductor Ltd |
| FSMC | First Security Mortgage Corporation |
| FSNL | Ferro Scrap Nigam Limited |
| FSNL | Ferro Scrap Nigam Ltd |
| FSP | Farnham Sgraffito Pottery |
| FSPL | Franciscan Solutions Pvt Ltd. |
| FSPL | Futuresoft Solutions Pvt Ltd |
| FSR | Falling Starr Ranch |
| FSRC | Federal Surplus Relief Corporation |