| OSHIN 2256373 · TMA1283028 | Suzhou rizi office & stationery co.ltd | 16 Paper | Registered | 2025 |
| OCHAME 2058240 · TMA1194542 | Godspeed Brewery Inc. | 32 Beer35 Advertising | Registered | 2023 |
| OCEAN 2056861 · TMA1283950 | Azul 3D, Inc. | 7 Machines40 Treatment | Registered | 2025 |
| OCAN 2002001 · TMA1131558 | an individual | 5 Pharmaceuticals | Registered | 2022 |
| OCEAN 1999509 · TMA1117475 · combined | Hawaii Sea Spirits, LLC | 33 Wine | Registered | 2022 |
| OCEAN 1899885 · TMA1088412 | Hawaii Sea Spirits, LLC | 33 Wine | Registered | 2020 |
| OCEAN 1847063 · TMA1070161 · design | Public Joint Stock Company Gazprom Neft | 4 Oils | Registered | 2020 |
| OCEAN 1454236 · TMA825572 · design | LEHIGH HANSON MATERIALS LIMITED | 7 Machines11 Lighting17 Rubber+1 | Registered | 2012 |
| OCEAN 1429419 · TMA825582 | LEHIGH HANSON MATERIALS LIMITED | 7 Machines11 Lighting17 Rubber+1 | Registered | 2012 |
| OCEAN 1381484 · TMA740170 | Schlumberger Canada Limited | 9 Electronics42 Science | Registered | 2009 |
| OCEAN 1346143 · TMA730340 | Oceanside Equipment Limited | 6 Metal7 Machines8 Hand | Registered | 2008 |
| OCEAN 1301484 · TMA698878 | ATRIUM MEDICAL CORPORATION, a legal entity | 10 Medical | Registered | 2007 |
| OCEAN 1115073 · TMA585161 | Flame Control Coatings, LLC | 2 Paints | Registered | 2003 |
| OCEAN 0991252 · NFLD1252 | THE STANDARD MANUFACTURING COMPANY LIMITED | 1 Chemicals2 Paints10 Medical+2 | Registered | 1924 |
| OCEAN 0673598 · TMA412266 | an individual | 9 Electronics | Registered | 1993 |
| OCEAN 2101881 · design | Owner not shown | 16 Paper20 Furniture21 Housewares+1 | Pending | 2021 |
| OCSAN 0971456 | Owner not shown | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2002 |
| OCEANIA 1256080 · TMA658384 | Acrylique Weedon (1995) Inc. | 3 Cosmetics11 Lighting | Registered | 2006 |
| OCEANIA 1209433 · TMA643688 · design | Cuisine Malimousse inc | 29 Meat30 Coffee | Registered | 2005 |
| OSCEAUN 2259726 | Qures Group Limited | 5 Pharmaceuticals | Pending | 2022 |
| OCEANIA 2084848 | Novus, Inc. | 18 Leather25 Clothing | Pending | 2021 |
| OSNO 2265566 · TMA1284961 | 3097-1238 Quebec Inc. | 25 Clothing35 Advertising | Registered | 2025 |
| OZANI 2249197 · TMA1267376 | an individual | 14 Jewellery35 Advertising | Registered | 2024 |
| Oxumii 2245480 · TMA1264436 | Guangzhou Xumiao Electronic Commerce Co. Ltd. | 9 Electronics | Registered | 2024 |
| Océane 2208012 · TMA1248183 | MX PRODUCTS INC | 7 Machines11 Lighting | Registered | 2024 |