| Abbreviation | Definition |
|---|---|
| CMOA | Columbus Museum of Art |
| CMOE | Children's Museum of Evansville |
| CMOG | Corning Museum Of Glass |
| CMOM | Children's Museum of Manhattan |
| CMON | Golisano Children's Museum of Naples |
| CMOT | Children's Museum Of Taipei |
| CMOTA | Children's Museum Of Tel-Aviv |
| CMP | California Museum of Photography |
| CMRM | Colorado Model Railroad Museum |
| CMSM | Combined Military Services Museum |
| CNAM | City of Norwich Aviation Museum |
| CNC | Canadian National Collection |
| CNFM | China National Film Museum |
| COA | Certificate Of Authenticity |
| COAM | Chiltern Open Air Museum |
| COAM | Chilterns Open Air Museum |
| COCA | Center Of Contemporary Art |
| COCA | Centre Of Contemporary Art |
| COMA | County of Orange Museum of Art |
| COMPT | Committee on Museum Professional Training |