| Acronym | Definition |
|---|
| PDSI | Palmer Drought Severity Index |
| PDSI | Pinnacle Data Systems Inc (Columbus, Ohio) |
| PDSI | Petascale Data Storage Institute (Carnegie Mellon University; Pittsburgh, PA) |
| PDSI | Principal Decision Systems International (Irvine, CA) |
| PDSI | Project Development Services, Inc. (Atlanta, GA) |
| PDSI | Personnel Development Skill Identifier (US Army) |
| PDSI | Project Development Skill Identifier |
| PDSI | Primeworld Digital Systems Inc. (Smart Communications Inc.; Philippines) |
| PDSI | Physical Disabilities & Sensory Impairment |
| PDSI | Palladium Silicide |
| PDSI | Portland Downtown Services, Inc. (Oregon) |
| PDSI | Phelps Dodge Sierrita, Inc. (Green Valley, AZ) |
| PDSI | Professional Development Skill Identifier |
| PDSI | Personal Density Scanning Imager (diagnostic radiology) |
| PDSI | Professional Development for School Improvement (teacher training) |
| PDSI | Project Design Services, Inc. (various locations) |
| PDSI | Parkinson's Disease Symptom Inventory (quality of life study) |
| PDSI | Proved Developed Shut In (hydrocarbon reserves) |
| PDSI | Professional Defense Solutions International (The Woodlands, TX) |