| DIATEC 1602359 · TMA923179 | Owner not shown | 9 Electronics10 Medical35 Advertising+2 | Registered | 2015 |
| DIATEC 1562787 · TMA864314 | DIAMED LAB SUPPLIES INC. | 9 Electronics | Registered | 2013 |
| DIYTEACH 2070934 · TMA1160328 · design | Zhejiang Teach E-Commerce Co.Ltd | 6 Metal | Registered | 2023 |
| Dayatech 2193176 | Ningbo High-tech Zone Dayatech Technology Development Co. Ltd. | 11 Lighting | Pending | 2022 |
| DITEC 1937383 · TMA1144979 | an individual | 6 Metal7 Machines9 Electronics+2 | Registered | 2022 |
| DUOTECH 1868664 · TMA1081610 · design | Keter Plastic Ltd. | 21 Housewares | Registered | 2020 |
| DUOTECH 1825157 · TMA1064806 · design | Keter Plastic Ltd. | 20 Furniture | Registered | 2019 |
| DUOTECH 1798711 · TMA1050825 · design | Keter Plastic Ltd. | 19 Building | Registered | 2019 |
| DUTECH 0897136 · TMA526785 | DUTECH MACHINERIE LTÉE | 6 Metal7 Machines16 Paper+2 | Registered | 2000 |
| DITCH 2187650 | DITCH LABS INC. | 42 Science | Pending | 2022 |
| DAYTECH 2185008 · design | QUANZHOU DAYTECH ELECTRONICS CO. LTD. | 9 Electronics | Pending | 2022 |
| DiaTech2000 1387934 · TMA772266 | Pharma Tech 2000 Inc. | 5 Pharmaceuticals30 Coffee | Registered | 2010 |
| dieWATCH 1910293 · TMA1146332 | TR ELECTRONICS CANADA INC. | 9 Electronics | Registered | 2022 |
| DOTCH 1935100 · TMA1123791 | TCL Communication Technology Holdings Limited | 9 Electronics | Registered | 2022 |
| 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 |
| DYTEC 1531008 · TMA845173 · design | NANTONG QIANGSHENG NEW MATERIALS TECHNOLOGY CO. LTD. | 6 Metal9 Electronics10 Medical+1 | Registered | 2013 |
| DOTECO 1310892 · TMA745678 · design | an individual | 7 Machines9 Electronics | Registered | 2009 |
| DIETEX 1269279 · TMA721463 | Energy Beverages LLC | 5 Pharmaceuticals | Registered | 2008 |
| DIDECO 1134589 · TMA608918 | an individual | 6 Metal7 Machines10 Medical | Registered | 2004 |
| DIOTEX 0992202 · NFLD2202 · design | LINN DALE JOHNSON, WARREN WILLIAM BURGESS AND RICHARD T. ALDWORTH TRADING UNDER THE NAME AND STYLE OF THE KNOX COMPANY | 1 Chemicals | Registered | 1937 |
| DIETICA 0801084 · TMA480336 | Owner not shown | 1 Chemicals3 Cosmetics4 Oils+2 | Registered | 1997 |
| DITAC 0595491 · TMA353733 | DuPont Electronics, Inc. | 1 Chemicals | Registered | 1989 |
| DITOSH 2316362 | an individual | 21 Housewares | Pending | 2024 |