| College of Technology, Hubei Engineering University | |
| Colluck Company Ltd | Hong Kong |
| Comba Telecom | Hong Kong |
| ComBerry | Shanghai |
| ComLogic Co. | Hong Kong |
| Commell | Taiwan |
| Committee of Communications Industry Development | Taiwan |
| COMMSAT | Beijing |
| Communication Association of Hong Kong | Hong Kong |
| Communication University of China | Beijing |
| Communication University of Zhejiang | |
| Communications Authority | |
| Compal, Inc. | Taiwan |
| Companhia de Telecomunicações de Macau S.A.R.L. | Macau |
| Compelite | Hong Kong |
| Compeq Co., Ltd | Taiwan |
| Component User Industry Co. | Taiwan |
| Compose System Ltd | Hong Kong |
| Computer and Technologies Holdings Ltd | Hong Kong |
| Computer Applications Co., Ltd | Hong Kong |
| Computer Audit Association | Taiwan |
| Computer Network Information Center, Chinese Academy of Science | Beijing |
| Computer Network Information Center, Chinese Academy of Sciences | |
| Computer Power Education Center | Hong Kong |
| Computer Skills Foundation | Taiwan |
| Computer Society of the Republic of China | Taiwan |
| Computer technology in Asia Network Co., Ltd | Macau |
| Computer Troubleshooters Hong Kong | Hong Kong |
| ComputerWorld Hong Kong | Hong Kong |
| Computex Taipei | Taiwan |
| Computing Age Co. | |
| Comweb | Taiwan |
| Conch Electronic Co., Ltd | Taiwan |
| Concord Information Technology International Ltd | Hong Kong |
| Connectec Electronics Co., Ltd | Taiwan |
| Connet One | |
| Consolidated Techniques Co., Ltd | |
| Contec Co., Ltd | |
| Convergence CT | Taiwan |
| Conversion.Rate Store Ltd | |
| Conwin Enterprises Co., Ltd | Taiwan |
| CoolBitX | |
| CoolMax Technology, Inc. | Taiwan |
| Coolpad | |
| Coolstech | |
| Copystar Information Corporation | Taiwan |
| Core Internet (Beijing) Technology Co., Ltd | Beijing |
| CORE Technology | Shanghai |
| Core-Tech Corporation | Taiwan |
| Corerain | |