Things known by the three-letter initialism FSV include:
- 3D File System Visualizer (fsv), a file system browser similar to fsn
- Fire Support Vehicle (such as the M1131 Stryker)
- Fisheries Survey Vessel (NOAA)
- Flexible Sender Validation
- Fort St. Vrain Generating Station
- Frauensportverein (Women´s Sports Club), as in FSV Gütersloh 2009
- Fußball- und Sportverein (Soccer and Sports Club), as in 1. FSV Mainz 05
- Faculty of Social Science at Charles University Prague
- Flavour Symmetry Violation, in particle physics