| DIPHARMA 1271599 · TMA715824 · design | an individual | 1 Chemicals | Registered | 2008 |
| DOBERMANN 1244267 · TMA648872 | an individual | 9 Electronics25 Clothing28 Toys | Registered | 2005 |
| DIVERMITE 0880517 · TMA546946 | an individual | 9 Electronics | Registered | 2001 |
| Defurhome 2086174 · TMA1183811 | Shenzhen Ruijin Trading Co. Ltd | 11 Lighting | Registered | 2023 |
| DEVIRON 2034788 · TMA1227659 | an individual | 1 Chemicals | Registered | 2024 |
| DBPRIME 1909426 · TMA1111821 | Owner not shown | 35 Advertising | Registered | 2021 |
| DEVRON 1869041 · TMA1042514 · design | Devron Developments Inc. | 35 Advertising36 Finance37 Construction | Registered | 2019 |
| 4DBARN 1851455 · TMA1016612 · design | Owner not shown | 9 Electronics16 Paper35 Advertising+3 | Registered | 2019 |
| 4DBARN 1824976 · TMA1051856 | Owner not shown | 9 Electronics16 Paper35 Advertising+3 | Registered | 2019 |
| DBRAND 1763753 · TMA981340 · design | dbrand inc. | 9 Electronics28 Toys40 Treatment | Registered | 2017 |
| DBRAND 1763751 · TMA959988 | dbrand inc. | 9 Electronics28 Toys40 Treatment | Registered | 2017 |
| DUBRANTIS 1751244 · TMA1044946 | an individual | 5 Pharmaceuticals | Registered | 2019 |
| doForms 1748375 · TMA1000217 | doForms, Inc. a New Jersey corporation | 9 Electronics | Registered | 2018 |
| DAVREN 1745143 · TMA1005664 | SKY BLUE WATER INC. | 32 Beer35 Advertising44 Medical | Registered | 2018 |
| 3dprintler 1649989 · TMA921294 | an individual | 7 Machines9 Electronics12 Vehicles+2 | Registered | 2015 |
| DEVPRIME 1628903 · TMA940308 | Owner not shown | 2 Paints | Registered | 2016 |
| DIPROINDUCA 1534676 · TMA829973 | DIPROINDUCA CANADA LIMITED | 6 Metal40 Treatment | Registered | 2012 |
| 1day1brand 1514179 · TMA849062 | 6464076 CANADA INC. | 35 Advertising41 Education | Registered | 2013 |
| DIFFFERENT 1414083 · TMA784490 · design | diffferent GmbH | 35 Advertising41 Education42 Science | Registered | 2010 |
| diffferent 1414082 · TMA784489 | diffferent GmbH | 35 Advertising41 Education42 Science | Registered | 2010 |
| debrand 1412455 · TMA785833 | Debrand Services Inc. | 37 Construction | Registered | 2010 |
| DUFFERINROCKSTAR 1285336 · TMA743498 · design | CRH CANADA GROUP INC. / GROUPE CRH CANADA INC. | 19 Building | Registered | 2009 |
| DUFFERIN 1000008 · TMA525304 | OldCastle Building Products Canada, Inc. | 19 Building | Registered | 2000 |
| DEPRIMEX 0874634 · TMA519897 | Les Laboratoires Suisse Inc. | 5 Pharmaceuticals | Registered | 1999 |
| DIAFORMER 0692368 · TMA511847 | OSAKA ORGANIC CHEMICAL INDUSTRY LTD. | 1 Chemicals | Registered | 1999 |