| POSI | Pain Of Salvation Influenced 
| Others |
| POSI | Parents Observation of Social Interaction
| Others |
| POSI | Partido Obrero Socialista Internacionalista
| Others |
| POSI | Peace Operations Summer Institute
| Others |
| POSI | Phobia Origins Structured Interview
| Others |
| POSI | Place Of Special Interest
| Others |
| POSI | Point Of Sale Intervention
| Others |
| POSI | Portable Operating System Interface
| Others |
| POSI | Position Of Safe Immobilisation
| Others |
| POSI | Positive Options Style Innovation
| Others |
| POSI | Productores Organicos de la Sierra coffee co-operative
| Others |
| POSI | Professional Office Systems Inc
| Others |
| POSI | Professional Outsourcing Solutions Inc
| Others |
| POSI | Promoting Conference for Osi
| Others |
| POSI | Prosthetic Orthotic Solutions International
| Others |
| POSI | Protection Of State Information
| Others |
| POSI | Public Offering Of Securities Insurance
| Others |