| Acronym | Definition |
|---|
| FCSU➣Financial Crime Surveillance Unit (various locations) |
| FCSU➣First Catholic Slovak Union (insurance; Independence, OH) |
| FCSU➣Franklin Central Supervisory Union (St. Albans, VT) |
| FCSU➣Federation of Civil Service Unions (Port Louis, Mauritius) |
| FCSU➣Fetal Cord Serum Ultrafiltrate |
| FCSU➣Fire Control Simulator Unit |