FIRO
| Acronym | Definition |
|---|---|
| FIRO | Fundamental Interpersonal Relationship Orientation |
| FIRO | Fonds d'Investissement de la Région de l'Oriental (French: Oriental Region Investment Fund; Morocco) |
| FIRO | Fellow of the Institution of Railway Operators (Institution of Railway Operators; UK) |
| FIRO | Force Integration Readiness Officer |
| FIRO | Free Internet Rating Organization (forum) |