| Acronym | Definition |
|---|
| InsO➣Insolvenzordnung (German insolvency law) |
| InsO➣Iraqi National Symphony Orchestra |
| InsO➣Iran National Standard Organization |
| InsO➣International New Symphony Orchestra |
| InsO➣Indian National Students Organisation (est. 2003; various locations) |
| InsO➣International Sudoku Organisation (UK) |