| O | Comparative & International Education Society | Others | |
| O | Comparative Education Research Centre | Others | |
| O | Comparative Education Society of Asia | Others | |
| O | Comparative Education Society of Hong Kong | Others | |
| O | Comparative Study of Learning Systems, National Center for Education and the Economy (NCEE) | Others | |
| O | Compassion Buddhist Institute, Sri Lanka | Others | |
| O | Competition Commission | Others | |
| O | Competition Sub-committee of the Energy Advisory Committee | Others | |
| O | Competitive Earmark Research Grant, Research Grants Council | Others | |
| O | Competitive Earmarked Research Grant, University Grant Council | Non-Statutory | |
| O | Competitive Research Funding Schemes for the Local Self-financing Degree Sector, RGC | Others | |
| O | Comprehensive Assessment Centre on Rehabilitation Services Needs, The Social Welfare Institute, Macau SAR government | Others | |
| O | Computational Intelligence Chapter, The Institute of Electrical and Electronics Engineers (Hong Kong Section) | Others | |
| O | Computational Visual Media | Others | |
| O | Computational Visual Media Conference 2017 | Others | |
| O | Computer Aided Architectural Design Futures Foundation, Netherlands | Others | |
| O | Computer Animation and Social Agents | Others | |
| O | Computer Graphics International | Others | |
| O | Computer Graphics International (2005, 2006) | Others | |
| O | Computer Science Department, HKU | Others | |
