| Acronym | Definition |
|---|
| FESN➣Family Education and Support Network (Oregon) |
| FESN➣Federação dos Estudantes (Portuguese: Federation of Students; Brazil) |
| FESN➣Friuli Experimental Seismie Network (Italian: Friuli Experimental Science Network; Friuli, Italy) |
| FESN➣Florida Emergency Supplier Network |
| FESN➣Far East Skate Network (Japan) |
| FESN➣Florida Endangered Species Network (est. 2004) |