| 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) |