| Acronym | Sense | Language | Topics |
|---|---|---|---|
| OSA | Oklahoma Sociological Association | In English | → Associations → Sociology → United States |
| OSA | Operational Support Area | In English | |
| OSA | Ordered-Subset Analysis | In English | |
| OSA | Ordo Sancti Augustini | In Latin | → Organizations and associations → Christianity |
| OSA | Operatori Spettacolo Associati | In Italian | |
| OSA | Operational Support Airlift | In English | |
| OSA | Officier Supérieur Adjoint | In French | → Military affairs |