English abbreviations from cls to cm
- CLS (Chehalis-Centralia Airport)
- CLSA (Contact Lens Society of America)
- CLSI (Clinical and Laboratory Standards Institute)
- CLSNET (Christian Legal Society Network)
- CLSP (Center for Law and Social Policy)
- CLSS (Combat Logistic Support Squadron)
- CLSSA (Cooperative Logistics Supply Support Arrangements)
- CLSU (Christian Legal Society University)
- CLT (Charlotte Douglas International Airport)
- CLTD (Civilian Leadership Training Division)
- CLTG (Center Level Transaction Group)
- CLU (Command launch unit)
- CLUE (Careers Learning Understanding And Exploring)
- CLUG (Clemson Linux Users Group)
- Clun. (Cluniacenses ("Monks of Cluny"))
- CLUSTER (Consortium Linking Universities Of Science And Technology For Education And Research)
- CLV (Caldas Novas Airport)
- Cl. V. (Clarissimus Vir ("Most Illustrious Man"))
- CLW (Clearwater Air Park)
- CLWR (Canadian Lutheran World Relief)
- CLX (Clorinda Airport)
- CLY (Calvi - Sainte-Catherine Airport)
- CLZ (Calabozo Airport)
- CM (Colour-marking or "continue mission")
- C.M. (Causa Mortis ("On occasion of death"))
