| DITEC 1937383 · TMA1144979 | an individual | 6 Metal7 Machines9 Electronics+2 | Registered | 2022 |
| DITAC 0595491 · TMA353733 | DuPont Electronics, Inc. | 1 Chemicals | Registered | 1989 |
| DITCH 2187650 | DITCH LABS INC. | 42 Science | Pending | 2022 |
| DIETICA 0801084 · TMA480336 | DÉVELOPPEMENT INDUSTRIALISATION ET PROMOTION DE TECHNOLOGIES AVANCÉES société par actions simplifiées | 1 Chemicals3 Cosmetics4 Oils+2 | Registered | 1997 |
| DIATECH 0722428 · TMA421647 | Owner not shown | 10 Medical | Registered | 1993 |
| DIATECH 2308222 · design | Owner not shown | 10 Medical | Pending | 2024 |
| DoItEco 2250201 | SAMSUNG ELECTRONICS CO. LTD. | 7 Machines9 Electronics11 Lighting | Pending | 2023 |
| DIYTEACH 2070934 · TMA1160328 · design | Zhejiang Teach E-Commerce Co.Ltd | 6 Metal | Registered | 2023 |
| DOTCH 1935100 · TMA1123791 | TCL Communication Technology Holdings Limited | 9 Electronics | Registered | 2022 |
| DOTC 1856253 · TMA1016095 | DotC United Inc | 9 Electronics35 Advertising38 Telecommunications+1 | Registered | 2019 |
| DITEK 1804716 · TMA995152 · design | Diversified Technology Group, Inc. | 9 Electronics42 Science | Registered | 2018 |
| DITEK 1804491 · TMA995171 | Diversified Technology Group, Inc. | 9 Electronics42 Science | Registered | 2018 |
| DETACH 1695235 · TMA983614 | Anatara Therapeutics Pty Ltd. | 5 Pharmaceuticals | Registered | 2017 |
| DIATEC 1602359 · TMA923179 | Owner not shown | 9 Electronics10 Medical35 Advertising+2 | Registered | 2015 |
| DIATEC 1562787 · TMA864314 | DIAMED LAB SUPPLIES INC. | 9 Electronics | Registered | 2013 |
| DYTEC 1531008 · TMA845173 · design | NANTONG QIANGSHENG NEW MATERIALS TECHNOLOGY CO. LTD. | 6 Metal9 Electronics10 Medical+1 | Registered | 2013 |
| DODUCO 1516275 · TMA964963 | Doduco GmbH | 9 Electronics14 Jewellery40 Treatment | Registered | 2017 |
| DITS 1393989 · TMA750932 | an individual | 9 Electronics35 Advertising42 Science | Registered | 2009 |
| DITTOS 1351390 · TMA822827 | DITTOS LLC | 25 Clothing | Registered | 2012 |
| DOTECO 1310892 · TMA745678 · design | an individual | 7 Machines9 Electronics | Registered | 2009 |
| DETICA 1233151 · TMA781638 | BAE SYSTEMS plc | 9 Electronics16 Paper35 Advertising+4 | Registered | 2010 |
| DIDECO 1134589 · TMA608918 | an individual | 6 Metal7 Machines10 Medical | Registered | 2004 |
| DUTECH 0897136 · TMA526785 | DUTECH MACHINERIE LTÉE | 6 Metal7 Machines16 Paper+2 | Registered | 2000 |
| DOTCO 0756841 · TMA456588 | Apex Brands, Inc. | 6 Metal7 Machines8 Hand | Registered | 1996 |
| DETAC 0698981 · TMA408553 | an individual | 1 Chemicals | Registered | 1993 |