| O | CAAD Futures Foundation | Others | |
| O | CAD & Graphics 2013 | Others | |
| O | CAD/Graphics (1999, 2001, 2003, 2005, 2006, 2007) | Others | |
| O | CADENZA (A Jockey Club Initiative for Seniors) | Others | |
| O | California EMS | Others | |
| O | Call Mira, The Zubin Foundation | Others | |
| O | Calligraphy Competition of Professional Teachers' union (Primary, Secondary and Open Levels) | Others | |
| O | Cambodia Ministry of Education, Youth, and Sports | Others | |
| O | Cambridge Chinese Christian Church | Others | |
| J | Camp for DM Children | | |
| O | Campus Today | Others | |
| O | Campus TV on SARS | Others | |
| O | Canadian Chamber of Commerce - Education Committee | Others | |
| O | Canadian Chamber of Commerce - Sustainability Committee | Others | |
| O | Canadian Foundation for AIDS Research, Toronto | Others | |
| O | Canadian International School - Career Week | Others | |
| O | Canadian Journal of Statistics | Others | |
| O | Cancer Association of South Africa (CANSA), South Africa | Others | |
| O | Cancer Co-ordinating Committee of Health, Welfare and Food Bureau | Others | |
| O | Cancer coordinating Committee | Others | |
