| Ourtroness 2301160 | Shenzhen Leihebo Cross-border E-commerce Co. Ltd. | 20 Furniture | Pending | 2023 |
| ORDERDYNAMICS 1574148 · TMA867565 | OrderDynamics Corporation | 9 Electronics35 Advertising41 Education+1 | Registered | 2013 |
| OrderGrid 2197640 · TMA1272637 | OrderGrid Holdings Inc. | 35 Advertising39 Transport42 Science | Registered | 2024 |
| Ordora 2157652 · TMA1208859 | an individual | 18 Leather21 Housewares | Registered | 2023 |
| ORTUR 2122173 · TMA1238116 · design | Dongguan Ortur Intelligent Technology Co., Ltd. | 7 Machines | Registered | 2024 |
| ORTUR 2113119 · TMA1229919 · design | Dongguan Ortur Intelligent Technologies Co.Ltd. | 35 Advertising | Registered | 2024 |
| Ortarco 2111011 · TMA1179328 | an individual | 18 Leather | Registered | 2023 |
| OrderStack 2065622 · TMA1156426 | TNGONE Inc | 35 Advertising | Registered | 2022 |
| OrderSpace 2018419 · TMA1257549 | Highspire Ltd | 9 Electronics42 Science | Registered | 2024 |
| ORATOIRE 360 1999658 · TMA1267790 | an individual | 41 Education | Registered | 2024 |
| ORATORY 360 1999651 · TMA1267789 | an individual | 41 Education | Registered | 2024 |
| ORDERGROOVE 1948898 · TMA1093833 | OrderGroove, Inc. | 42 Science | Registered | 2021 |
| ORDR 1908815 · TMA1092368 · design | OMW APP, LLC | 9 Electronics | Registered | 2021 |
| ORDRSLIP 1908814 · TMA1113813 | OMW APP, LLC | 9 Electronics | Registered | 2021 |
| ORDERSODNOW 1842880 · TMA1079523 · design | The Greenhorizons Group of Farms Ltd. | 35 Advertising36 Finance44 Medical | Registered | 2020 |
| ORDERWISE 1797565 · TMA988202 | MEDCURRENT CORPORATION | 42 Science44 Medical | Registered | 2018 |
| ORDERLY 1729089 · TMA998134 | Consolidated Concepts, LLC | 9 Electronics35 Advertising42 Science | Registered | 2018 |
| ORDERSTREAM 1638932 · TMA921726 | Commerce Technologies, LLC | 42 Science | Registered | 2015 |
| ORDER 1632100 · TMA949074 | an individual | 3 Cosmetics | Registered | 2016 |
| ORIDERMA 1615863 · TMA903561 | ORIMED PHARMA INC. | 5 Pharmaceuticals | Registered | 2015 |
| ORADUR 1501559 · TMA810632 | Durect Corporation | 5 Pharmaceuticals | Registered | 2011 |
| OROTORO 1485320 · TMA798793 | EVERESTO GROUP INC./ GROUPE EVERESTO INC. | 35 Advertising39 Transport43 Restaurants | Registered | 2011 |
| OrderIP 1474249 · TMA792135 | INTERNATIONAL PAPER COMPANY | 35 Advertising | Registered | 2011 |
| ORTHORALIX 0866334 · TMA515578 | DENTAL IMAGING TECHNOLOGIES CORPORATION | 10 Medical | Registered | 1999 |
| ORDERPATH 0848670 · TMA530912 | NeuStar, Inc. | 9 Electronics | Registered | 2000 |