| Acronym | Definition |
|---|
| FAI | Football Association of Ireland (Irish Republic's governing body of soccer) |
| FAI | Fondo Ambiente Italiano (Italian: Italian Environment Fund) |
| FAI | Fonds d'Aide à l'Investissement (French: Help Fund Investment) |
| FAI | Fédération Aéronautique Internationale |
| FAI | Federal Acquisition Institute |
| FAI | Fresh Air Intake (engineering) |
| FAI | Frais d'Agence Inclus (French: Agency Fees Included) |
| FAI | Fournisseur d'Acces Internet (French Internet access provider) |
| FAI | Free Androgen Index (estimating physiologically active testosterone.) |
| FAI | Folk Alliance International (Kansas City, MO) |
| FAI | Fellow of the (chartered) Auctioneers' Institute |
| FAI | Fully Automatic Installation |
| FAI | Functional Ankle Instability |
| FAI | First Article Inspection (quality check) |
| FAI | Frenchay Activities Index (stroke patients measure of disability) |
| FAI | Food Allergy Initiative (est. 1998) |
| FAI | Federación Anarquista Ibérica (Anarchist Federation of Iberia) |
| FAI | Federazione Apicoltori Italiani (Federation of Italian Apiculturlists) |
| FAI | First Article Inspection |
| FAI | Functional Aerobic Impairment |
| FAI | Federazione Anarchica Italiana (Italian Anarchist Federation) |
| FAI | Fixed Asset Investment |
| FAI | Fondation Arabe pour l'Image (Beirut, Lebanon) |
| FAI | Fire Alarm Interface (software) |
| FAI | First Aid Instruction (UK) |
| FAI | Femoro-Acetabular Impingement |
| FAI | Fonds de l'Autoroute de l'Information |
| FAI | Fertiliser Association of India (New Delhi) |
| FAI | Forget About It |
| FAI | Fédération des Associations d'Architectes et d'Ingénieurs de Genève (French: Federation of Associations of Architects and Engineers of Geneva; Switzerland) |
| FAI | Fire/Arson Investigation |
| FAI | Freeze Agro Ingénierie (French engineering company) |
| FAI | Functional Area Inspection (US Marine Crops) |
| FAI | France Agro Industries (fishing) |
| FAI | Futon Association International |
| FAI | Filweb Asia, Inc. (Laguna, Philippines) |
| FAI | Fairbanks, AK, USA - Fairbanks International Airport (Airport Code) |
| FAI | Friday Afternoon Inspection (Citadel; Charleston, SC) |
| FAI | Femoral Acetabular Impingement |
| FAI | Fauske and Associates (Westinghouse) |
| FAI | Fédération Abolitionniste Internationale (French: International Abolitionist Federation) |
| FAI | Fonderie Atlantique Industrie (French: Atlantic Foundry Industry) |
| FAI | Field-Aligned Irregularity |
| FAI | Fair Act Inventory |
| FAI | First Aid Injury |
| FAI | Final Acceptance Inspection |
| FAI | Fail as Is |
| FAI | Forced Air Induction |
| FAI | Foundation for the American Indian (Greenwich, Connecticut) |
| FAI | Federal Agency for Industry (Russia) |
| FAI | Fonds d'Aide a l'Innovation (French: Assistance Fund for Innovation) |
| FAI | Fire Arm Injury |
| FAI | Fujitsu America Incorporated |
| FAI | Fly As Is |
| FAI | Fluor Alaska International |
| FAI | Frequency Application Index |