| Acronym | Definition |
|---|
| FDI | Foreign Direct Investment (political science/economics) |
| FDI | Forum des Droits sur l'Internet (French: Rights Forum on the Internet) |
| FDI | Faculty Development Institute |
| FDI | Financial Derivative Instrument |
| FDI | Fault Detection and Isolation |
| FDI | Flash Data Integrator |
| FDI | Forward Defect Indicator |
| FDI | Financing Data Initiative (Canada) |
| FDI | Financial Destination, Inc. (Windham, NH) |
| FDI | Fédération Dentaire Internationale (World Dental Federation) |
| FDI | Fujirebio Diagnostics, Inc. (Malvern, PA) |
| FDI | Fraud Discovery Institute |
| FDI | Following Distance Indication |
| FDI | Fire Danger Index |
| FDI | First Dorsal Interosseous |
| FDI | Falun Dafa Information Center (New York, NY) |
| FDI | Fonds Départemental d'Insertion (French: Departmental Integration Fund) |
| FDI | Food Distributors International |
| FDI | Failure Detection and Isolation |
| FDI | Fretwell-Downing Informatics |
| FDI | First Data International (various locations) |
| FDI | Full Diplomatic Immunity |
| FDI | Fondurile Deschise de Investitii (Romanian: Investment Trust) |
| FDI | Feeder Distribution Interface |
| FDI | Flash Data Integrator (software read-while-write data manager for flash memory from Intel) |
| FDI | France Dépoussiérage Industriel (French industrial cleaning company) |
| FDI | First Day Issue (philately) |
| FDI | Fiduciaire de Distribution Internationale (French: International Distribution Trust) |
| FDI | Forward Defect Indication |
| FDI | Flavor Dynamics, Inc. (South Plainfield, NJ) |
| FDI | Future Device Integration |
| FDI | Foundation for Design Integrity |
| FDI | Fiber Distribution Interface |
| FDI | Flight Director Indicator |
| FDI | Fluor Daniel, Inc. |
| FDI | Financial Development Institution |
| FDI | Fertilizer Distribution Improvement |
| FDI | Flight Display Integration |
| FDI | Forward Delay Indicator (Cisco) |
| FDI | Facility Determination Inquiry |
| FDI | Fixed Induction Date |