| DECORO 1473442 · TMA802118 · design | Sofimed Ltd | 20 Furniture | Registered | 2011 |
| DEJERO 1446448 · TMA834243 | DEJERO LABS INC. | 9 Electronics35 Advertising37 Construction+4 | Registered | 2012 |
| DEXERO 1396842 · TMA753707 · design | Dexero inc. | 9 Electronics42 Science | Registered | 2009 |
| DDCZero 2291992 | Owner not listed | 7 Machines | Pending | 2023 |
| DEXERA 2260269 · TMA1279415 · design | Voyage Building Products Inc. | 6 Metal19 Building | Registered | 2024 |
| DECRE 1847935 · TMA1028822 | TAICANG ZHANXIN ADHESIVE MATERIAL CO. LTD | 17 Rubber | Registered | 2019 |
| DECHRA 1764593 · TMA1011952 | Dechra Pharmaceuticals Limited | 5 Pharmaceuticals10 Medical31 Fresh+2 | Registered | 2018 |
| DEUGRO 1721261 · TMA958688 · design | an individual | 35 Advertising36 Finance39 Transport+1 | Registered | 2016 |
| DECORA 1656892 · TMA956304 | Arterra Wines Canada, Inc. | 33 Wine35 Advertising40 Treatment+1 | Registered | 2016 |
| DEUGRO 1450384 · TMA782729 | an individual | 35 Advertising36 Finance39 Transport | Registered | 2010 |
| DUCERA 1421007 · TMA759570 | DeguDent GmbH | 5 Pharmaceuticals | Registered | 2010 |
| DECORA 1377161 · TMA743341 | 911979 Alberta Ltd. | 4 Oils11 Lighting14 Jewellery+2 | Registered | 2009 |
| DECORA 1115067 · TMA590183 | Leviton Manufacturing Co. Inc. (a Delaware corporation) | 9 Electronics | Registered | 2003 |
| DECORA 0829400 · TMA479190 | MasterBrand Cabinets LLC | 20 Furniture | Registered | 1997 |
| DECKER 0644702 · TMA378950 | DECKER MANAGEMENT LTD. | 37 Construction44 Medical | Registered | 1991 |
| DECOR 0488274 · TMA298251 | THE DECOR CORPORATION PTY. LTD. | 8 Hand9 Electronics11 Lighting+2 | Registered | 1984 |
| DÉCOR 0424514 · TMA241331 · design | Hunter Douglas Canada Holdings Inc. | 9 Electronics20 Furniture | Registered | 1980 |
| DECRA 0419259 · TMA240072 | AHI Roofing Limited | 6 Metal | Registered | 1980 |
| DECORA 0386743 · TMA214365 | LEVITON MANUFACTURING COMPANY INCORPORATED | 9 Electronics | Registered | 1976 |
| DECOR 0271585 · TMA130994 | CASCADES CANADA ULC | 16 Paper24 Textiles | Registered | 1963 |
| DEACRO 2326828 | Deacro Industries Ltd. | 7 Machines9 Electronics | Pending | 2024 |
| DUCERE 2315689 · design | Ducere Global Business School Pty Ltd. | 41 Education | Pending | 2024 |
| DECKER 2266694 | Kimberly, LLC | 20 Furniture | Pending | 2023 |
| Decora 2193172 | A-1 Bags & Supplies Inc. | 16 Paper21 Housewares | Pending | 2022 |
| Deskhero 2255580 · TMA1276166 | Deskhero Inc | 9 Electronics | Registered | 2024 |