| CONSIGNACTION 1172866 · TMA663525 · design | Association québécoise de récupération des contenants de boissons | 35 Advertising39 Transport41 Education | Registered | 2006 |
| Consignaction 1172865 · TMA663247 | Association québécoise de récupération des contenants de boissons | 35 Advertising | Registered | 2006 |
| CONSECTUS 1995504 | an individual | 1 Chemicals5 Pharmaceuticals | Pending | 2019 |
| CONCACAF 1430115 · TMA791401 | The Confederation of North, Central American and Caribbean Association Football (CONCACAF) | 38 Telecommunications41 Education | Registered | 2011 |
| CONCAST 0886987 · TMA530257 | A Cubed Corporation (a Pennsylvania corporation) | 6 Metal | Registered | 2000 |
| CONACAST 0484906 · TMA281122 | CYTEC TECHNOLOGY CORP. | 6 Metal9 Electronics16 Paper | Registered | 1983 |
| CONSISTA 2178621 | W.R. GRACE & CO. - CONN. | 1 Chemicals | Pending | 2022 |
| CANCOCKTION 1912534 · TMA1091003 | an individual | 33 Wine | Registered | 2021 |
| CONSISTAIDE 0844502 · TMA493219 | PRODUITS ALIMENTAIRES BERTHELET INC. / BERTHELET FOOD PRODUCTS INC. | 30 Coffee | Registered | 1998 |
| CONGESPIRIN 0282236 · TMA147173 | BRISTOL-MYERS SQUIBB COMPANY | 5 Pharmaceuticals | Registered | 1966 |
| CHANGESELF 2249917 · TMA1268795 · design | Changeself Technology (Shenzhen) Co. Ltd. | 9 Electronics35 Advertising42 Science | Registered | 2024 |
| CONNEXIS 2224211 · TMA1241887 | Phoenix Contact GmbH & Co. KG | 9 Electronics | Registered | 2024 |
| CamCasle 2186929 · TMA1234584 | shenzhen feiyan huanqiu E-Commerce Co.Ltd | 9 Electronics | Registered | 2024 |
| CamCoach 2167327 · TMA1200535 | Spireon, Inc. | 9 Electronics | Registered | 2023 |
| COMSIGN 2141270 · TMA1206204 | ComSign Ltd. | 42 Science | Registered | 2023 |
| cannookies 2123446 · TMA1186589 | an individual | 30 Coffee | Registered | 2023 |
| CAMZYOS 2117717 · TMA1193613 · design | MyoKardia, Inc. | 5 Pharmaceuticals | Registered | 2023 |
| Cimkiz 2112345 · TMA1269193 | Shenzhen Cimkiz Technology Co. Ltd. | 6 Metal20 Furniture28 Toys | Registered | 2024 |
| CANNACASE 2094791 · TMA1172511 | an individual | 34 Tobacco | Registered | 2023 |
| CANNASUCRES 2086849 · TMA1107884 | ROSE LIFESCIENCE INC. | 30 Coffee32 Beer | Registered | 2021 |
| CANESEEKER 2043754 · TMA1151659 | MARK ANTHONY GROUP INC. | 33 Wine | Registered | 2022 |
| Canachoice 2030389 · TMA1141244 | an individual | 9 Electronics | Registered | 2022 |
| CAMZYOS 2023662 · TMA1193214 | MyoKardia, Inc. | 5 Pharmaceuticals | Registered | 2023 |
| CHAINSHOUSE 2023188 · TMA1137458 · design | Guangzhoushi Beicheng Trade Co Ltd | 14 Jewellery | Registered | 2022 |
| CanSecWest 2015049 · TMA1130642 | an individual | 41 Education | Registered | 2022 |