| Acronym | Definition |
|---|
| PDI | Protein Disulfide Isomerase |
| PDI | Personal Docente e Investigador (Spanish: Personal Educational and Investigating) |
| PDI | Plumbing and Drainage Institute |
| PDI | Pre Delivery Inspection |
| PDI | Philippine Daily Inquirer |
| PDI | Pacific Data Images |
| PDI | Professional Development Institute |
| PDI | Personnel Decisions International (human resources consulting company) |
| PDI | Partai Demokrasi Indonesia |
| PDI | Personal Disposable Income |
| PDI | Polydispersity Index |
| PDI | Preservation Description Information |
| PDI | Power Doppler Imaging |
| PDI | Professional Development Initiative |
| PDI | Previously Disadvantaged Individual (South Africa) |
| PDI | Precision Devices Inc. |
| PDI | Past Due Interest |
| PDI | Performance Demonstration Initiative |
| PDI | Phase Doppler Interferometry (measurement tool to characterize liquid spray behavior) |
| PDI | Payload Data Interleaver |
| PDI | Plan de Développement International de Bruxelles |
| PDI | Pedestrian Danger Index |
| PDI | Parti Démocratique Islamique (Islamic Democratic Party, Rwanda) |
| PDI | Project Development Institute |
| PDI | Potential Daily Intake |
| PDI | Potentially Disqualifying Information |
| PDI | Precision Drilling International |
| PDI | Post Detection Integration |
| PDI | Please Do Investigate |
| PDI | Pressure Differential Indicator (industrial control description) |
| PDI | Partia për Drejtësi dhe Integrim (Albanian: Party of Justice and Integration) |
| PDI | Parti Démocratique pour l'Independence (French: Democratic and Independence Party, Morocco) |
| PDI | Primary Data Input (hot rolling mills) |
| PDI | Pilot's Direction Indicator |
| PDI | Potential Discrepancy Item (DISA Database Security Technical Implementation Guide) |
| PDI | Pre-Dispositional Investigation |
| PDI | Point Dipole Interaction |
| PDI | PONTIS Data Interchange |
| PDI | Pituitary Diabetes Insipidus |
| PDI | Path Defect Indicator |
| PDI | Power Dimension Inc. |
| PDI | Predetermined Income (financial services industry) |
| PDI | Pre-Designated-Items |
| PDI | Product Deficiency Investigation |
| PDI | ProFiles Data Interchange |
| PDI | Perspective Dark-Field Imaging (semiconductor wafer inspection) |
| PDI | Prospect Data Integration |
| PDI | Predeployment Inspection |
| PDI | POM Development Instructions |
| PDI | Predisciplinary Interview |
| PDI | Precision Driving Instructor |
| PDI | Product Data Index (configuration management) |
| PDI | Professional Development - IP Committee |
| PDI | Per Delivery Inspection |