| APSO | Acadia Parish Sheriff's Office 
| Others |
| APSO | African Professional Staffing Organisations
| Others |
| APSO | Agency for Personal Service Overseas
| Others |
| APSO | Agency for Personal Services Overseas
| Others |
| APSO | Alabama Power Service Organization
| Others |
| APSO | Amicale Panhard du Sud Ouest
| Others |
| APSO | Asia Pacific Stroke Organisation
| Others |
| APSO | Association of Personnel Service Organisations
| Others |
| APSO | Association of Professional Scholastic Opticians
| Others |
| APSO | Asylum Pre Screening Officer
| Others |
| APSO | Audio Precision System One
| Others |
| APSO | Audiology Practice Standards Organization
| Others |