| Acronym | Definition |
|---|
| USAPI➣United States Association of Professional Investigators |
| USAPI➣United States Associated Pacific Islands |
| USAPI➣United States Affiliated Pacific Islands |
| USAPI➣United States Army Peacekeeping Institute |
| USAPI➣Unión de Sindicatos y Asociaciones Profesionales Independientes (Spanish: Independent union of Unions and Professional Associations) |