| ONESING 2020998 · TMA1157956 | Shenzhen Suruiketa Technology Co. Ltd | 25 Clothing | Registered | 2022 |
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| ONESYNC 1769409 · TMA978038 | Weatherford Technology Holdings, LLC | 9 Electronics | Registered | 2017 |
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| ONESUMX 1698410 · TMA979174 | Owner not shown | 35 Advertising36 Finance42 Science+1 | Registered | 2017 |
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| ONSON 2032896 · TMA1139663 | Shenzhen Weizhisheng E-Commerce Co.Ltd. | 7 Machines | Registered | 2022 |
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| ONSON 2003667 · TMA1143464 · design | Shenzhen Weizhisheng E-Commerce Co.Ltd. | 7 Machines | Registered | 2022 |
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| ONSEN 1954250 · TMA1192262 · design | NuEnergy Distribution Inc. | 11 Lighting | Registered | 2023 |
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| ONESAM 1910330 · TMA1086840 · design | Guangzhou Zheng Gong Niu Technology Co. Ltd. | 9 Electronics | Registered | 2020 |
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| ONEGIN 1708158 · TMA1036834 | Owner not shown | 32 Beer33 Wine35 Advertising+2 | Registered | 2019 |
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| 1ONESAND 2006293 | BRAMPTON BRICK LIMITED/ BRIQUE BRAMPTON LIMITÉE | 19 Building | Pending | 2020 |
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| 1ONESAND 2006286 · design | BRAMPTON BRICK LIMITED/ BRIQUE BRAMPTON LIMITÉE | 19 Building | Pending | 2020 |
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| ONEXONE 1357631 · TMA772818 | ONEXONE Foundation | 14 Jewellery25 Clothing | Registered | 2010 |
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| ONEXONE 1351887 · TMA717690 · design | ONEXONE Foundation | 35 Advertising | Registered | 2008 |
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| ONEXONE 1260745 · TMA664818 | ONEXONE Foundation | 35 Advertising | Registered | 2006 |
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| ONEZONE 2272756 | SPEC FURNITURE INC. | 6 Metal19 Building20 Furniture+4 | Pending | 2023 |
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| OMNISAN 2194122 · design | OmniLyte Enviro Inc. | 1 Chemicals3 Cosmetics5 Pharmaceuticals+2 | Pending | 2022 |
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| ONEJOON 2123569 | ONEJOON GmbH | 7 Machines11 Lighting42 Science | Pending | 2021 |
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| OMNISAN 2113493 | OmniLyte Enviro Inc. | 1 Chemicals5 Pharmaceuticals11 Lighting+3 | Pending | 2021 |
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| ONEZONE 2060213 | Global Resources International, Inc. | 10 Medical | Pending | 2020 |
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| ONEAGENT 2141675 · TMA1250808 | Dynatrace LLC | 9 Electronics | Registered | 2024 |
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| OneCem 2134167 · TMA1240962 | Holcim Technology Ltd | 19 Building | Registered | 2024 |
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| ONESMART 1906120 · TMA1096234 | Shanghai Jingxuerui Information Science and Technology Co. Ltd. | 41 Education | Registered | 2021 |
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| ONGENSMA 1897220 · TMA1088339 | an individual | 5 Pharmaceuticals | Registered | 2020 |
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| ONESMART 1879747 · TMA1096232 · design | Shanghai Jingxuerui Information Science and Technology Co. Ltd. | 41 Education | Registered | 2021 |
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| ONYXEN 1714004 · TMA950207 | an individual | 1 Chemicals | Registered | 2016 |
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| OMNISCAN 1163808 · TMA629574 | Olympus NDT Canada inc. | 9 Electronics | Registered | 2005 |
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