| OOSHEE 1981145 | Azzi Holdings Inc. | 9 Electronics29 Meat30 Coffee+3 | Pending | 2019 |
| OSEE 2239668 · TMA1259966 · design | Osee Technology Co. Ltd. | 9 Electronics | Registered | 2024 |
| OSEE 2175255 · TMA1259445 · design | Osee Technology Co. Ltd. | 9 Electronics35 Advertising38 Telecommunications+1 | Registered | 2024 |
| OSEEA 2160354 · TMA1218491 | Allergan Sales, LLC | 5 Pharmaceuticals | Registered | 2024 |
| OSEA 1921695 · TMA1109904 | an individual | 3 Cosmetics | Registered | 2021 |
| OGEE 1920991 · TMA1143242 | Ogee, Inc. | 3 Cosmetics5 Pharmaceuticals35 Advertising | Registered | 2022 |
| OSHO 1863805 · TMA1095081 | Osho International Foundation | 9 Electronics16 Paper35 Advertising+4 | Registered | 2021 |
| OSE 1528011 · TMA844055 · design | an individual | 3 Cosmetics5 Pharmaceuticals | Registered | 2013 |
| OSHO 1034463 · TMA564680 | Osho International Foundation | 9 Electronics16 Paper41 Education+1 | Registered | 2002 |
| OSE 2347232 | Owner not listed | 9 Electronics | Pending | 2024 |
| OCHE 2266385 | Owner not listed | 9 Electronics28 Toys41 Education+1 | Pending | 2022 |
| OCHE 2247168 · design | Owner not shown | 9 Electronics28 Toys41 Education+1 | Pending | 2022 |
| OGEE 2221838 · design | Ogee, Inc. | 3 Cosmetics5 Pharmaceuticals35 Advertising | Pending | 2022 |
| Osé 2181059 | 9419-7670 Quebec inc | 9 Electronics35 Advertising | Pending | 2022 |
| OSZE 0971451 · design | ORGANIZATION FOR SECURITY AND CO-OPERATION IN EUROPE / ORGANISATION POUR LA SÉCURITÉ ET LA COOPÉRATION EN EUROPE | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2001 |
| OSCE 0971450 · design | ORGANIZATION FOR SECURITY AND CO-OPERATION IN EUROPE / ORGANISATION POUR LA SÉCURITÉ ET LA COOPÉRATION EN EUROPE | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2001 |
| OSZE 0971448 | ORGANIZATION FOR SECURITY AND CO-OPERATION IN EUROPE / ORGANISATION POUR LA SÉCURITÉ ET LA COOPÉRATION EN EUROPE | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2001 |
| OSCE 0971447 | ORGANIZATION FOR SECURITY AND CO-OPERATION IN EUROPE / ORGANISATION POUR LA SÉCURITÉ ET LA COOPÉRATION EN EUROPE | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2001 |
| ohyeahus 2264292 · TMA1283374 | an individual | 5 Pharmaceuticals | Registered | 2025 |
| OOSSXX 2258072 · TMA1277735 · design | Shenzhenshi Xiankailike Technology Co. Ltd | 9 Electronics | Registered | 2024 |
| OKK 2256870 · TMA1276298 · design | OKK INTERNATIONAL (HONG KONG) CO. LIMITED | 34 Tobacco | Registered | 2024 |
| OKG 2254704 · TMA1273110 | Shanghai NVSMART Technology Co. Ltd. | 6 Metal9 Electronics17 Rubber | Registered | 2024 |
| OK 2253930 · TMA1273003 · design | Astral IP Enterprise Ltd. | 9 Electronics | Registered | 2024 |
| OSQ 2253155 · TMA1270254 | Owner not listed | 11 Lighting | Registered | 2024 |
| OHJA 2248120 · TMA1253153 · design | an individual | 34 Tobacco | Registered | 2024 |