| ODESSA 1907945 · TMA1101108 | Sundance Spas, Inc. | 11 Lighting | Registered | 2021 |
| ODESSA 1882252 · TMA1086945 | Odessa Technologies, Inc. | 9 Electronics42 Science | Registered | 2020 |
| ODESSA 1761541 · TMA957308 | Hearts on Fire Company, LLC | 14 Jewellery | Registered | 2016 |
| ODESSA 1156860 · TMA614247 | GILLES FERRON INC. | 29 Meat35 Advertising | Registered | 2004 |
| ODESSA 2090502 | Senior Group LLC | 9 Electronics42 Science44 Medical | Pending | 2021 |
| ODEKA 1719106 · TMA967843 · design | an individual | 3 Cosmetics9 Electronics14 Jewellery+5 | Registered | 2017 |
| ODES 1571206 · TMA846929 | 1211311 Alberta Ltd. | 1 Chemicals4 Oils6 Metal+8 | Registered | 2013 |
| ODESK 1549644 · TMA866252 | Upwork Global Inc. | 9 Electronics35 Advertising41 Education | Registered | 2013 |
| ODESI 1439540 · TMA799918 | Ontario Council of University Libraries (OCUL) an affiliate of the Council of Ontario Universities (COU) | 16 Paper42 Science | Registered | 2011 |
| OETZI 2226399 · TMA1252601 · design | BEIJING JIURICHENG TECHNOLOGY AND TRADE CO. LTD. | 25 Clothing | Registered | 2024 |
| Outus 2226069 · TMA1251285 | SHENZHEN JUANJING NETWORK TECHNOLOGY CO., LTD. | 16 Paper | Registered | 2024 |
| OTSO 2221581 · TMA1239045 | OTSO CYCLES, LLC | 12 Vehicles | Registered | 2024 |
| Oddekey 2217670 · TMA1245520 | an individual | 21 Housewares | Registered | 2024 |
| OUTASK 2203845 · TMA1239969 · design | Shenzhen Habitat Technology Co., Ltd. | 11 Lighting | Registered | 2024 |
| Odokee 2177243 · TMA1227243 | Shenzhen Yixunjie Electronic Commerce Co. Ltd. | 14 Jewellery | Registered | 2024 |
| ODIGO 2168359 · TMA1284350 · design | ODIGO | 9 Electronics38 Telecommunications42 Science | Registered | 2025 |
| Otsu 2149431 · TMA1228865 | an individual | 9 Electronics14 Jewellery18 Leather+2 | Registered | 2024 |
| OYedis 2148261 · TMA1205183 | Dongguan Yichen Electronics Co. Ltd | 11 Lighting | Registered | 2023 |
| Ottoza 2144451 · TMA1201677 | an individual | 8 Hand13 Firearms | Registered | 2023 |
| OHDOKI 2135543 · TMA1236968 · design | an individual | 9 Electronics10 Medical | Registered | 2024 |
| OTUHSI 2129061 · TMA1192044 | an individual | 25 Clothing | Registered | 2023 |
| OTAK 2107332 · TMA1181719 | an individual | 3 Cosmetics | Registered | 2023 |
| OODAAQ 2094741 · TMA1162662 · design | an individual | 33 Wine | Registered | 2023 |
| OTTUS 2038299 · TMA1141330 | LVGLOMARK Corp. | 18 Leather21 Housewares25 Clothing+1 | Registered | 2022 |
| ODYSSEY 2036351 · TMA1132852 | Orbis Corporation | 20 Furniture | Registered | 2022 |