| Acronym | Definition |
|---|
| OspA➣Outer Surface Protein A |
| OspA➣Office of Sponsored Projects Administration |
| OspA➣Orquestra Sinfônica de Porto Alegre (Porto Alegre, Brazil) |
| OspA➣Oregon State Pharmacy Association (est. 1889) |
| OspA➣Oregon School Personnel Association |
| OspA➣Oxygenated Solvent Producers Association |
| OspA➣Open Services Partner Alliance (Avant Telecom, Inovative Systems, Nextone, Sonus) |
| OspA➣Ohio School Psychologists Association |
| OspA➣Oregon School Psychologists Association |
| OspA➣Oklahoma School Psychological Association |
| OspA➣Operator Service Providers of America |
| OspA➣Oregon State Poets Association |
| OspA➣Operations Security Professionals Association |
| OspA➣Office of Systems Product Assurance |