| DECLIP 1813040 · TMA1056015 · design | Keter Plastic Ltd. | 6 Metal19 Building20 Furniture | Registered | 2019 |
| DOCLABEL 2158245 · TMA1193958 | Doctor Evidence, LLC | 42 Science | Registered | 2023 |
| DOUGHLAB 2094630 · TMA1196508 | an individual | 9 Electronics | Registered | 2023 |
| DSLEAF 2070664 · TMA1216848 | an individual | 18 Leather | Registered | 2024 |
| DOJOLVI 1995744 · TMA1121633 | Ultragenyx Pharmaceutical Inc. | 5 Pharmaceuticals | Registered | 2022 |
| DSolve 1959171 · TMA1245743 | 9256-2669 Québec inc. | 3 Cosmetics | Registered | 2024 |
| DXLOVER 1938497 · TMA1111099 | Shenzhen Kaixinyu Technology Co.Ltd. | 10 Medical20 Furniture21 Housewares | Registered | 2021 |
| DycloPro 1889007 · TMA1065971 | an individual | 5 Pharmaceuticals | Registered | 2019 |
| DGGLIFE 1880975 · TMA1058599 · design | an individual | 25 Clothing | Registered | 2019 |
| DASLOOP 1856883 · TMA1063364 | an individual | 9 Electronics16 Paper25 Clothing+2 | Registered | 2019 |
| DESLOUPS 1771004 · TMA1011743 | Design Québec Isabelle Deslauriers Inc | 25 Clothing | Registered | 2018 |
| DISSOLVETECH 1730482 · TMA1015610 · design | an individual | 3 Cosmetics5 Pharmaceuticals6 Metal+2 | Registered | 2019 |
| DISSOLVETECH 1730472 · TMA1015609 | an individual | 3 Cosmetics5 Pharmaceuticals6 Metal+2 | Registered | 2019 |
| DIZOLVE 1658577 · TMA917449 · design | Dizolve Group Corporation | 3 Cosmetics | Registered | 2015 |
| DISSOLVE 1628839 · TMA943074 | Dissolve Inc. | 9 Electronics18 Leather21 Housewares+4 | Registered | 2016 |
| DISKLAVIER 1587842 · TMA894497 | YAMAHA CORPORATION A LEGAL ENTITY | 35 Advertising41 Education | Registered | 2015 |
| DigiLife 1557183 · TMA867042 | Nikon-Essilor Co., Ltd. | 9 Electronics | Registered | 2013 |
| DASliving 1459293 · TMA778129 | an individual | 36 Finance45 Legal | Registered | 2010 |
| DIESELPOWER 1445669 · TMA776816 | GOLD EAGLE CO. | 1 Chemicals | Registered | 2010 |
| DIZOLVE 1429428 · TMA777715 | Dizolve Group Corporation | 3 Cosmetics | Registered | 2010 |
| DAXglobal 1335224 · TMA729260 | Qontigo Index GmbH | 16 Paper35 Advertising36 Finance | Registered | 2008 |
| DISKLAVIERMUSICSTORE 1332576 · TMA720187 | YAMAHA CORPORATION A LEGAL ENTITY | 9 Electronics35 Advertising | Registered | 2008 |
| DIGILIFE 1320103 · TMA707119 · design | Life Technologies Co. Ltd. | 9 Electronics | Registered | 2008 |
| DISKLAVIERRADIO 1283541 · TMA703262 | YAMAHA CORPORATION A LEGAL ENTITY | 15 Musical38 Telecommunications41 Education+1 | Registered | 2007 |
| DECOLAV 1278461 · TMA702000 | DECO LAV, INC. | 6 Metal11 Lighting20 Furniture+1 | Registered | 2007 |