| OSHLINE 0911252 | The Canadian Centre for Occupational Health and Safety | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 1999 |
| OSLANE 2202888 · TMA1238906 · design | an individual | 6 Metal28 Toys | Registered | 2024 |
| OXYLINE 2037484 · TMA1155073 · design | Owner not shown | 9 Electronics | Registered | 2022 |
| OZOLINE 1968891 · TMA1255580 | Messer Canada Inc. | 1 Chemicals | Registered | 2024 |
| OcuLine 1683977 · TMA908886 | CanMedApps, Inc | 9 Electronics35 Advertising44 Medical | Registered | 2015 |
| OXILINE 1178337 · TMA636305 | RESCO PRODUCTS, INC. | 19 Building | Registered | 2005 |
| OXILINE 2372143 | an individual | 6 Metal7 Machines9 Electronics+2 | Pending | 2024 |
| OSLEN 2102912 · TMA1190630 | Huizhou Lighthouse E-Commerce Co. Ltd. | 27 Carpets | Registered | 2023 |
| OSLON 1569779 · TMA891122 | an individual | 9 Electronics | Registered | 2014 |
| OAKLINS 1767050 · TMA1026648 | an individual | 35 Advertising36 Finance | Registered | 2019 |
| OXYLANE 1430420 · TMA771546 | an individual | 35 Advertising37 Construction39 Transport | Registered | 2010 |
| OXYLANE 1383255 · TMA744484 | DECATHLON, SA | 6 Metal9 Electronics12 Vehicles+10 | Registered | 2009 |
| OXYLANE 1371787 · TMA752433 | an individual | 13 Firearms25 Clothing28 Toys+4 | Registered | 2009 |
| OKOLENE 0688414 · TMA422183 | THE OKONITE COMPANY INC. | 17 Rubber | Registered | 1994 |
| OXYLANE 2016868 | DECATHLON | 9 Electronics11 Lighting12 Vehicles+3 | Pending | 2019 |
| OCULAN 2241542 · TMA1257037 | STRYKER CORPORATION | 10 Medical | Registered | 2024 |
| OZYILIAN 2228499 · TMA1252774 | Dongguan Binhe Clothing Co. Ltd. | 25 Clothing | Registered | 2024 |
| OXILAM 2141935 · TMA1200330 | Shenzhen Axi Technology Co. Ltd. | 11 Lighting | Registered | 2023 |
| OSELAN 2136792 · TMA1238162 | SETALG | 1 Chemicals | Registered | 2024 |
| OSCILLOMAX 2094770 · TMA1234283 | PATEK, PHILIPPE SA GENÈVE | 14 Jewellery | Registered | 2024 |
| OXLUMO 1980916 · TMA1144239 · design | Alnylam Pharmaceuticals, Inc. | 5 Pharmaceuticals | Registered | 2022 |
| OXLUMO 1953392 · TMA1150827 | Alnylam Pharmaceuticals, Inc. | 5 Pharmaceuticals | Registered | 2022 |
| OZLANA 1932773 · TMA1110048 · design | Zhejiang Aosilan Shoes Co. Ltd. | 18 Leather25 Clothing | Registered | 2021 |
| Ozalin 1897228 · TMA1091900 | an individual | 5 Pharmaceuticals | Registered | 2021 |
| OKLand 1894272 · TMA1073671 | AUCKLAND MEDICAL POLYMER (TIANJIN) CO. LTD. | 5 Pharmaceuticals10 Medical20 Furniture+1 | Registered | 2020 |