| DECERO 1372107 · TMA753871 | an individual | 33 Wine | Registered | 2009 |
| DEEZER 1995726 · TMA1216727 · design | DEEZER | 9 Electronics38 Telecommunications41 Education | Registered | 2024 |
| DOCKER 1866309 · TMA1094936 · design | Docker, Inc. a corporation legally organized under the laws of the state of Delaware | 9 Electronics | Registered | 2021 |
| DOCKER 1854319 · TMA1030115 | LAKES OF MUSKOKA COTTAGE BREWERY INC. | 33 Wine | Registered | 2019 |
| DOCKER 1708851 · TMA1029500 | LAKES OF MUSKOKA COTTAGE BREWERY INC. | 32 Beer | Registered | 2019 |
| DOCKER 1662952 · TMA918822 · design | Docker, Inc. a corporation legally organized under the laws of the state of Delaware | 9 Electronics | Registered | 2015 |
| DOCKER 1654725 · TMA920086 | Docker, Inc. a corporation legally organized under the laws of the state of Delaware | 9 Electronics | Registered | 2015 |
| DEEZER 1620786 · TMA939813 · design | Owner not shown | 35 Advertising36 Finance38 Telecommunications+2 | Registered | 2016 |
| DECORO 1473442 · TMA802118 · design | Sofimed Ltd | 20 Furniture | Registered | 2011 |
| DEJERO 1446448 · TMA834243 | DEJERO LABS INC. | 9 Electronics35 Advertising37 Construction+4 | Registered | 2012 |
| DUCERA 1421007 · TMA759570 | DeguDent GmbH | 5 Pharmaceuticals | Registered | 2010 |
| DEXERO 1396842 · TMA753707 · design | Dexero inc. | 9 Electronics42 Science | Registered | 2009 |
| DECKER 0644702 · TMA378950 | DECKER MANAGEMENT LTD. | 37 Construction44 Medical | Registered | 1991 |
| DOCKER 0545381 · TMA323694 | LEVI STRAUSS NOVA SCOTIA ULC | 25 Clothing | Registered | 1987 |
| DOZER 0309424 · TMA159179 | Snap-on Incorporated (a Delaware corporation) | 7 Machines12 Vehicles20 Furniture+1 | Registered | 1968 |
| Dazzoro 2348620 | Owner not listed | 14 Jewellery35 Advertising | Pending | 2024 |
| DUCERE 2315689 · design | Ducere Global Business School Pty Ltd. | 41 Education | Pending | 2024 |
| DEEZER 2310747 · design | DEEZER | 9 Electronics38 Telecommunications41 Education | Pending | 2023 |
| DECKER 2266694 | Kimberly, LLC | 20 Furniture | Pending | 2023 |
| DEXERA 2260269 · TMA1279415 · design | Voyage Building Products Inc. | 6 Metal19 Building | Registered | 2024 |
| Deskhero 2255580 · TMA1276166 | Deskhero Inc | 9 Electronics | Registered | 2024 |
| DAKORIE 2247006 · TMA1265907 | Owner not listed | 9 Electronics | Registered | 2024 |
| DISIOR 2207419 · TMA1198282 | Paragon 28, Inc. | 42 Science | Registered | 2023 |
| DCARE 2199316 · TMA1223249 | Owner not shown | 35 Advertising37 Construction41 Education+1 | Registered | 2024 |
| DEGREE 2173793 · TMA1274107 | Conopco, Inc. | 9 Electronics35 Advertising41 Education | Registered | 2024 |