| FEI | Faculdade De Engenharia Industrial 
| Others |
| FEI | Far East and International
| Others |
| FEI | Farscape Episode Images
| Others |
| FEI | Fatal Error Infotable (Geoworks)
| Others |
| FEI | Fatuous Egotistic Individuals
| Others |
| FEI | FDA (Food and Drug Administration) Establishment Identifier
| Others |
| FEI | Federal Employer Identification
| Others |
| FEI | Federal Equestrian Institute
| Others |
| FEI | Federal Executive Institute
| Others |
| FEI | Federation Equestre International
| Others |
| FEI | Federation Equestre Internationale
| Others |
| FEI | Federation of Equestrians International
| Others |
| FEI | File Exchange Interface
| Others |
| FEI | Financial Executive International
| Others |
| FEI | Financial Executives Institute
| Others |
| FEI | Financial Executives International
| Others |
| FEI | Fitness Events Incorporated
| Others |
| FEI | Florida Education Institute
| Others |
| FEI | Fortuna etiam invidente
| Others |
| FEI | Fremeau Efficiency Index
| Others |
| FEI | Frequency Electronics Inc
| Others |
| FEI | Front End of Innovation
| Others |
| FEI | Fully Electronic Ignition
| Others |
| FEI | Functional Enrichment Index
| Others |
| FEI | Functionally Emulative Increment
| Others |
| FEI | Fundacao Educacional Inaciana
| Others |
| FEI | Future Executives Institute
| Others |