| Abbreviation | Definition |
|---|---|
| COCE | Conference on Communication and Environment |
| COCM | Code Officials Conference of Michigan |
| COD | Conference |
| COD | Conference Organizing Distribution |
| COFE | Conference of Food Engineering |
| COFE | Conference on Future Energy |
| COGM | Conference of Grand Masters |
| COHAC | Conference on Humanitarian Action for Children |
| COHSE | Confederation of Health Service Employees |
| COIL | Congress On Ionic Liquids |
| COLA | Conferences On Line Allergy |
| COLDA | Conference On Liver Disease in Africa |
| COLLOQ | IEEE COLLOQuium on South America |
| COLT | Conference on Learning Theory |
| COMDEX | Computer Dealers Exposition |
| COMMAD | Conference on Optoelectronic and Microelectronic Materials and Devices |
| COMMAD | Conference on Optoelectronics and Microelectronic Materials And Devices |
| COMPA | Conference Of Minority Public Administrators |
| COMPASS | COMPuter ASSurance Conference |
| COMPCON | IEEE COMPuter Society International CONference |