| Acronym | Sense | Language | Topics |
|---|---|---|---|
| COS | Carry-On Oxygen System | In English | |
| COS | Checkout Station | In English | |
| COS | Console Operating System | In English | → Operating systems |
| COS | Comité d'Orientation Scientifique | In French | → Mathematics and natural sciences |
| COS | Comité des Oeuvres Sociales | In French | → Social welfare |
| COS | Coefficient d'Occupation des Sols | In French | → Accommodation → Regional planning |
| COS | Complément d'Objet Second | In French | → Language, linguistics, literature |
| COS | Comité Opérationnel Sécurité | In French | |
| COS | Commandant des Opérations de Secours | In French | → Firefighting → Traumatology |