| HEATRAP 0498601 · TMA311782 | 7592574 Canada Inc. | 11 Lighting20 Furniture24 Textiles+1 | Registered | 1986 |
| HEATRAP 0458871 · TMA260814 | 7592574 Canada Inc. | 25 Clothing | Registered | 1981 |
| HYDROPLATE 2250403 · TMA1267452 | Carboline International Corporation | 2 Paints | Registered | 2024 |
| HYDRABURN 2249567 · TMA1268704 | Owner not listed | 5 Pharmaceuticals | Registered | 2024 |
| HYDRAPLAY 2229029 · TMA1252870 | BrandCo Elizabeth Arden 2020 LLC | 3 Cosmetics | Registered | 2024 |
| HYDROBIOX 2217986 · TMA1230723 | 11814192 Canada Inc. | 11 Lighting17 Rubber40 Treatment | Registered | 2024 |
| HYDRABOOTY 2216251 · TMA1245418 | HydraFacial LLC | 44 Medical | Registered | 2024 |
| HYDROPORT 2180840 · TMA1211373 | Access Vascular, Inc. | 10 Medical | Registered | 2023 |
| HYDRAFLASH 2135407 · TMA1225151 | DD Karma LLC | 8 Hand9 Electronics | Registered | 2024 |
| HydroVu 2132366 · TMA1175231 | In-Situ, Inc. | 9 Electronics | Registered | 2023 |
| HydroPrime 2124079 · TMA1196822 | Nanjing Nutrabuilding Bio-tech Co. Ltd. | 1 Chemicals | Registered | 2023 |
| HydraFacialist 2111624 · TMA1160510 | HydraFacial LLC | 44 Medical | Registered | 2023 |
| HYDROPAD 2105098 · TMA1275638 | Güntner GmbH & Co. KG | 7 Machines9 Electronics11 Lighting | Registered | 2024 |
| HydroBLU 2105097 · TMA1284236 | Güntner GmbH & Co. KG | 7 Machines9 Electronics11 Lighting | Registered | 2025 |
| HYDROVEDA 2094686 · TMA1219017 | Global Beauty Science Holdings, Inc. | 3 Cosmetics | Registered | 2024 |
| Hydroflyer 2088662 · TMA1177488 | Uni Electric Watercraft Group Inc. | 28 Toys | Registered | 2023 |
| HYDROBUCKET 2058565 · TMA1169876 · design | Visionary Hydroponics Inc. | 21 Housewares | Registered | 2023 |
| HYDROVENT 2053674 · TMA1139790 · design | HYDROVENT LLC | 9 Electronics | Registered | 2022 |
| HYDRAPHASE 2044513 · TMA1165533 | an individual | 3 Cosmetics | Registered | 2023 |
| HYDROBUILDER 2041389 · TMA1121773 · design | Hydrobuilder Holdings LLC | 35 Advertising | Registered | 2022 |
| HiTherapy 2036832 · TMA1268135 | 2749103 Ontario Ltd. | 44 Medical45 Legal | Registered | 2024 |
| HydroBlock 2025958 · TMA1275231 | CENTRE INTERDISCIPLINAIRE DE DÉVELOPPEMENT EN CARTOGRAPHIE DES OCÉANS (CIDCO) | 9 Electronics | Registered | 2024 |
| HYDRIFY 2010934 · TMA1129833 | HYDRIFY INC. | 32 Beer | Registered | 2022 |
| Hydraplex 2007611 · TMA1108708 | ROLLPACK | 16 Paper | Registered | 2021 |
| HYDROVANTAGE 1955014 · TMA1213679 | Owner not shown | 10 Medical | Registered | 2023 |