| HYDROLABS 0423984 · TMA240349 | ALLIED COLLOIDS LICENSING CORP. (A DELAWARE CORPORATION) | 1 Chemicals | Registered | 1980 |
| HYDRALAX 1850415 · TMA1080812 | Strides Pharma Canada Inc. | 5 Pharmaceuticals | Registered | 2020 |
| HYDROLAC 1336816 · TMA717451 | Sally Beauty International, Inc. | 3 Cosmetics | Registered | 2008 |
| Hydroleaf 2224807 · TMA1251185 | Hydroleaf Intelligent Produce Co. Ltd. | 29 Meat30 Coffee31 Fresh+1 | Registered | 2024 |
| HYDRALEAF 2061751 · TMA1277151 · design | Hydraleaf Corporation | 5 Pharmaceuticals29 Meat30 Coffee+3 | Registered | 2024 |
| HYDRALEAF 2061743 · TMA1277149 | Hydraleaf Corporation | 5 Pharmaceuticals29 Meat30 Coffee+3 | Registered | 2024 |
| HYDRALUBE 0716659 · TMA421243 | CANADA PIPE COMPANY LTD. | 11 Lighting | Registered | 1993 |
| HYDRAULAN 0658862 · TMA402545 | an individual | 1 Chemicals4 Oils | Registered | 1992 |
| "HYDRHOLAC" 0185389 · UCA20549 | ROHM & HAAS COMPANY | 2 Paints | Registered | 1944 |
| HYDRALUBE 2293548 | Dura-Line LLC | 4 Oils | Pending | 2023 |
| HYDROLUBE 2223630 | Michelman, Inc. | 1 Chemicals | Pending | 2022 |
| HYDRALEAF 2061755 · design | Hydraleaf Corporation | 5 Pharmaceuticals29 Meat30 Coffee+3 | Pending | 2020 |
| Hotreals 2205698 · TMA1240236 | Shenzhen Huayuxin Technology Co., Ltd. | 9 Electronics | Registered | 2024 |
| HYDROLEATHER 2197744 · TMA1266976 | Smart, LLC | 3 Cosmetics | Registered | 2024 |
| HeatRoll 2176737 · TMA1227126 | SHENZHEN YUYAN INDUSTRIAL LIMITED | 34 Tobacco | Registered | 2024 |
| HYDROLIQ 2136716 · TMA1236974 | an individual | 1 Chemicals5 Pharmaceuticals37 Construction+1 | Registered | 2024 |
| HIDARLING 2125408 · TMA1197806 | an individual | 25 Clothing | Registered | 2023 |
| HITROLINK 2117334 · TMA1184116 · design | Zhejiang Huachuang Vision Technology Co. Ltd. | 9 Electronics | Registered | 2023 |
| HYDROLUX 2059809 · TMA1239404 · design | 9399-7070 Québec inc. | 1 Chemicals | Registered | 2024 |
| Hydryalix 2031057 · TMA1148931 · design | Allergan Pharmaceuticals International Limited | 5 Pharmaceuticals | Registered | 2022 |
| HYDRALIGHT 1991041 · TMA1223469 | Unilever Canada Inc. | 3 Cosmetics | Registered | 2024 |
| HydraLytica 1974857 · TMA1128229 | dynaCERT Inc. | 38 Telecommunications | Registered | 2022 |
| HYDRALIXIR 1940575 · TMA1167400 | Owner not shown | 1 Chemicals | Registered | 2023 |
| HYDROLOUNGE 1916783 · TMA1105808 | JACUZZI INC. | 11 Lighting | Registered | 2021 |
| HYDRAULEX 1905412 · TMA1105525 · design | Attica Hydraulic Exchange, Inc. | 7 Machines35 Advertising37 Construction | Registered | 2021 |