FCSU
| 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 |