| Acronym | Definition |
|---|
| CLSO➣Certified Laser Safety Officer (Laser Institute of America) |
| CLSO➣Certified Lodging Security Officer |
| CLSO➣Club Logistique du Sud-Ouest (French: Southwest Logistics Club; est. 1998) |
| CLSO➣Community Learning Support Organization |
| CLSO➣Confocal Laser Scanning Ophthalmoscope (ophthalmology) |
| CLSO➣Contingency Landing Support Officer (NASA) |
| CLSO➣Canadian Launch Safety Office (Transport Canada) |
| CLSO➣Comptoir de Lunetterie du Sud-Ouest (French optical instrument manufacturer) |