| FSU | Faculty Student Union 
| Others |
| FSU | Fast Service Upgrade
| Others |
| FSU | Fast Software Upgrade
| Others |
| FSU | Fayetteville State University
| Others |
| FSU | Felon State University
| Others |
| FSU | Ferris State University
| Others |
| FSU | Fiber Service Unit
| Others |
| FSU | Field Supervision Unit
| Others |
| FSU | Figure Skating Universe
| Others |
| FSU | File Support Utility
| Others |
| FSU | Finishes Second Usually
| Others |
| FSU | Fitchburg State University
| Others |
| FSU | Fjolbrautaskoli Sudurlands University
| Others |
| FSU | Flight Station Unit
| Others |
| FSU | Floating Subtraction
| Others |
| FSU | Florida Scares Us
| Others |
| FSU | Florida Seminoles Unconquered
| Others |
| FSU | Florida State
| Others |
| FSU | Florida State Unconquered
| Others |
| FSU | Florida State University
| Others |
| FSU | Florida State University's
| Others |
| FSU | Florida's Sorriest University
| Others |
| FSU | Floridas Second University
| Others |
| FSU | Floridas Sorriest University
| Others |
| FSU | Floriduh State University
| Others |
| FSU | Foggy State University
| Others |
| FSU | Football School Unlimited
| Others |
| FSU | Football Suspensions U
| Others |
| FSU | For Sale University
| Others |
| FSU | Former Soviet Union
| Others |
| FSU | Forward Support Unit
| Others |
| FSU | Framingham State University
| Others |
| FSU | Fredonia State University
| Others |
| FSU | Free Seafood University
| Others |
| FSU | Free Shellfish University
| Others |
| FSU | Free Shoes University
| Others |
| FSU | Free Shopping University
| Others |
| FSU | Free Standing Unit
| Others |
| FSU | Free-Standing Unit
| Others |
| FSU | Freon Servicing Unit
| Others |
| FSU | Fresno State Univ
| Others |
| FSU | Friends Shall Unite
| Others |
| FSU | Friends Stand United
| Others |
| FSU | Frostburg State University
| Others |
| FSU | Fuk Shing Umbrella
| Others |