ONSL
| Acronym | Definition |
|---|---|
| ONSL | Old North St. Louis (neighborhood just north of downtown St Louis, MO) |
| ONSL | Oilexco North Sea Limited (Canada) |
| ONSL | Optical Network Simulation Layer (VPI) |
| ONSL | Organization Nationale des Syndicats Libres (National Organization of Free Unions, Burkina Faso) |