| Acronym | Definition |
|---|
| PSOI➣Preston School of Industry (band) |
| PSOI➣Phuture Sound of Ibiza (band) |
| PSOI➣Pacific Specialty Oils, Inc. (California) |
| PSOI➣Primera Sociedad Ocular Integral (Spanish: Premier Comprehensive Ocular Society; Argentina) |
| PSOI➣Power Silicon on Insulator |
| PSOI➣Post-Spaceflight Orthostatic Intolerance |