| ISLS | Industrial Standard Lubrication System 
| Others |
| ISLS | Institute for Spanish Language Studies
| Others |
| ISLS | Interdisciplinary School of Life Sciences
| Others |
| ISLS | International Society for Language Studies
| Others |
| ISLS | International Society of the Learning Sciences
| Others |
| ISLS | International Summer Language School
| Others |
| ISLS | International Symposium on Luminescence Spectrometry
| Others |