| ODISSI 2295801 · design | Owner not listed | 18 Leather25 Clothing | Pending | 2023 |
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| ODASI 1567286 · TMA869297 | 7752105 CANADA INC. | 14 Jewellery18 Leather25 Clothing+1 | Registered | 2014 |
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| ODESI 1439540 · TMA799918 | Ontario Council of University Libraries (OCUL) an affiliate of the Council of Ontario Universities (COU) | 16 Paper42 Science | Registered | 2011 |
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| ODIS 1356539 · TMA715566 | an individual | 20 Furniture | Registered | 2008 |
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| ODIGO 2168359 · TMA1284350 · design | ODIGO | 9 Electronics38 Telecommunications42 Science | Registered | 2025 |
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| ODASS 1881613 · TMA1069095 · design | 9374-7806 Québec inc. | 11 Lighting20 Furniture | Registered | 2020 |
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| ODIGO 1852308 · TMA1117651 | ODIGO | 9 Electronics38 Telecommunications42 Science | Registered | 2022 |
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| OTIS 1811667 · TMA1017718 · design | Otis Products, Inc. dba Otis Technology, Inc. | 1 Chemicals4 Oils8 Hand+4 | Registered | 2019 |
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| ODS 1646277 · TMA951696 | L'OREAL (SOCIETE ANONYME) | 3 Cosmetics | Registered | 2016 |
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| OTIS 1630126 · TMA939071 | TForce Holdings Inc. | 35 Advertising | Registered | 2016 |
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| OTISS 1573169 · TMA857730 | TRANSOFT SOLUTIONS INC. | 39 Transport42 Science | Registered | 2013 |
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| ODES 1571206 · TMA846929 | 1211311 Alberta Ltd. | 1 Chemicals4 Oils6 Metal+8 | Registered | 2013 |
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| ODESK 1549644 · TMA866252 | Upwork Global Inc. | 9 Electronics35 Advertising41 Education | Registered | 2013 |
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| OTIS 1184152 · TMA670295 | Aspire Bakeries LLC | 30 Coffee | Registered | 2006 |
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| OTIS 0991691 · NFLD1691 · design | OTIS ELEVATOR COMPANY | 7 Machines9 Electronics16 Paper+1 | Registered | 1929 |
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| OTIS 0991379 · NFLD1379 | OTIS ELEVATOR COMPANY | 7 Machines9 Electronics13 Firearms+2 | Registered | 1926 |
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| OTIS 0573185 · TMA345741 | OTIS ELEVATOR COMPANY (A NEW JERSEY CORPORATION) | 37 Construction | Registered | 1988 |
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| OTIS 0230156 · TMA108234 | Halliburton Energy Services, Inc. (a Delaware Corporation) | 1 Chemicals2 Paints3 Cosmetics+5 | Registered | 1957 |
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| OTIS 0230155 · TMA108233 · design | Halliburton Energy Services, Inc. (a Delaware Corporation) | 1 Chemicals2 Paints3 Cosmetics+5 | Registered | 1957 |
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| OTIS 0159840 · TMDA56612 · design | OTIS ELEVATOR COMPANY (A NEW JERSEY CORPORATION) | 3 Cosmetics7 Machines9 Electronics+1 | Registered | 1933 |
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| OTIS 0159839 · TMDA57039 | OTIS ELEVATOR COMPANY (A NEW JERSEY CORPORATION) | 3 Cosmetics7 Machines9 Electronics+1 | Registered | 1933 |
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| ODAS 2256329 | ARA Robotique Inc. | 41 Education42 Science | Pending | 2023 |
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| OYedis 2148261 · TMA1205183 | Dongguan Yichen Electronics Co. Ltd | 11 Lighting | Registered | 2023 |
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| OHDOKI 2135543 · TMA1236968 · design | an individual | 9 Electronics10 Medical | Registered | 2024 |
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| OTUHSI 2129061 · TMA1192044 | an individual | 25 Clothing | Registered | 2023 |
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