| CERENCE 1996247 | Cerence Operating Company | 9 Electronics42 Science | Pending | 2019 |
| CERENCE 1996246 · design | Cerence Operating Company | 9 Electronics42 Science | Pending | 2019 |
| CURRENCE 2197813 | Currence, Inc. | 9 Electronics36 Finance | Pending | 2022 |
| CORENSO 1547930 · TMA863282 · design | Corenso North America, LLC | 16 Paper | Registered | 2013 |
| CORNICE 1518061 · TMA866918 | MARK ANTHONY GROUP INC. | 33 Wine | Registered | 2013 |
| CORANCO 1317566 · TMA701636 | GROUPE SEB CANADA INC. | 35 Advertising | Registered | 2007 |
| CORENEST 1909081 · TMA1091590 | HONEYWELL INTERNATIONAL INC. | 9 Electronics21 Housewares | Registered | 2021 |
| CURRENCY 1622233 · TMA881527 | JPI Limited | 14 Jewellery | Registered | 2014 |
| CURRENCY 1412224 · TMA760163 | CTI Paper USA, Corp. | 16 Paper | Registered | 2010 |
| CORNICHE 0389331 · TMA217212 | an individual | 12 Vehicles | Registered | 1976 |
| CORENGTH 2054960 | DECATHLON | 5 Pharmaceuticals10 Medical18 Leather+5 | Pending | 2020 |
| CRUNCH+ 2173233 · TMA1205453 | Crunch IP Holdings, LLC | 41 Education | Registered | 2023 |
| Crinca 2112511 · TMA1179397 | Shenzhen Zhijia Technology Co. Ltd. | 9 Electronics | Registered | 2023 |
| CORNCOB 1879524 · TMA1082538 | PRO-Equipment, Inc. | 11 Lighting | Registered | 2020 |
| CRUNCH 1620096 · TMA914663 · design | Crunch IP Holdings, LLC | 9 Electronics18 Leather25 Clothing+1 | Registered | 2015 |
| CORYNEX 1587537 · TMA945222 | AJINOMOTO CO. INC. | 40 Treatment42 Science | Registered | 2016 |
| CORNAC 1541147 · TMA830716 | BRÛLÉ MÉDIA INC. | 9 Electronics16 Paper41 Education | Registered | 2012 |
| CORONIS 1514944 · TMA870026 | LOCKHEED MARTIN CORPORATION | 9 Electronics40 Treatment42 Science | Registered | 2014 |
| CORNJ 1451939 · TMA772503 | THE OPERATING ROOM NURSES ASSOCIATION OF CANADA (ORNAC) ASSOCIATION DES INFIRMIERES ET INFIRMIERS DE SALLES D'OPERATION DU CANADA (AIISOC). | 16 Paper | Registered | 2010 |
| CRUNCH 1329360 · TMA761675 | YTV CANADA, INC. | 9 Electronics16 Paper35 Advertising+2 | Registered | 2010 |
| CRUNCH 1192699 · TMA674594 · design | Crunch IP Holdings, LLC | 18 Leather25 Clothing28 Toys | Registered | 2006 |
| COREMIX 1175629 · TMA616045 | Diversity Technologies Corporation | 7 Machines | Registered | 2004 |
| CORINOX 1036066 · TMA547976 · design | an individual | 6 Metal7 Machines8 Hand | Registered | 2001 |
| CRUNCH 1029194 · TMA553484 | Maxxsonics, LLC | 9 Electronics | Registered | 2001 |
| CORINEX 1013903 · TMA570190 | Corinex Communications Corp. | 9 Electronics35 Advertising41 Education+1 | Registered | 2002 |