| CANNFECTIONS 1875404 · TMA1080109 | Cannfections Group Inc. | 3 Cosmetics5 Pharmaceuticals29 Meat+2 | Registered | 2020 |
| CONFESSIONS 1869065 · TMA1069419 | Vins Arterra Canada, division Québec, Inc. | 33 Wine | Registered | 2020 |
| CONFUCIUS 1312136 · TMA747065 · design | DEVELOPMENT CENTER FOR TEACHING CHINESE AS A FOREIGN LANGUAGE OF THE MINISTRY OF EDUCATION P.R.C. | 16 Paper41 Education | Registered | 2009 |
| CONVECTION 1242506 · TMA720438 | Microsoft Corporation | 9 Electronics | Registered | 2008 |
| CONVICTIONAL 2221724 | Convictional Commerce, Inc. | 42 Science | Pending | 2022 |
| CONFIGURATIONS 1212295 · TMA686112 | RUBBERMAID INCORPORATED, a corporation of Ohio | 20 Furniture | Registered | 2007 |
| CONFESS!!!! 2059954 · TMA1155232 | an individual | 25 Clothing | Registered | 2022 |
| COMPACTIUM 1666737 · TMA900566 | manuflow inc. | 11 Lighting | Registered | 2015 |
| CONFUSION 1472046 · TMA791617 | 1198054 B.C. Ltd. | 33 Wine | Registered | 2011 |
| CONFECSHURE 1061563 · TMA575109 | BALCHEM CORPORATION, a corporation of MARYLAND | 30 Coffee | Registered | 2003 |
| CONFESS 0556394 · TMA327658 | PARFUMS DE COEUR, LTD. | 3 Cosmetics | Registered | 1987 |
| CONVECTAIR 0510888 · TMA295449 · design | GLEN DIMPLEX AMERICAS LIMITED | 9 Electronics | Registered | 1984 |
| CONFOCHIMER 2171679 | an individual | 1 Chemicals42 Science | Pending | 2022 |
| CNMOFAXIN 2262491 · TMA1281390 | Guangdong Xinyingrong Pharmaceutical Technology Co. Ltd. | 3 Cosmetics | Registered | 2025 |
| Chmibasu 2257954 · TMA1277717 | Tongcheng Haoying E-Commerce Center | 28 Toys | Registered | 2024 |
| CMHFKKG 2252798 · TMA1271502 | Shanghai Buzhi Gardening Co. Ltd. | 21 Housewares | Registered | 2024 |
| COMPOSTABLES 2243961 · TMA1263143 · design | Owner not listed | 8 Hand16 Paper21 Housewares | Registered | 2024 |
| COMBOSYNC 2243877 · TMA1243402 | Owner not listed | 42 Science | Registered | 2024 |
| COMBOCARBON 2243721 · TMA1243400 | Owner not listed | 42 Science | Registered | 2024 |
| Canfacture 2233501 · TMA1261390 | an individual | 35 Advertising | Registered | 2024 |
| CompHost 2219156 · TMA1230725 | an individual | 40 Treatment | Registered | 2024 |
| CONFIXX 2215634 · TMA1233962 | an individual | 1 Chemicals | Registered | 2024 |
| COMBOCURVE 2212057 · TMA1243060 | ComboCurve, Inc. | 42 Science | Registered | 2024 |
| CONVÉS 2209934 · TMA1230650 | Owner not shown | 33 Wine | Registered | 2024 |
| COMPOST 2208633 · TMA1225514 | Eco Tan Pty Ltd | 3 Cosmetics | Registered | 2024 |