| Acronym | Definition |
|---|
| IISA | Insurance Institute of South Africa (Johannesburg, South Africa) |
| IISA | International Inline Skating Association (trade organization) |
| IISA | Institut International des Sciences Administratives |
| IISA | Icarda International School of Aleppo (Aleppo, Syria) |
| IISA | International Italian Student Association |
| IISA | International Italian Student Association (Berkeley, California) |
| IISA | Ishikawa Information Support Association (Japan) |
| IISA | Integrated Information System Architecture |
| IISA | Interservice or Interagency Support Agreement |