PSOI
| 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 |