| ORPENS 1673126 · TMA1035113 | Juice Hunt Ltd | 32 Beer33 Wine | Registered | 2019 |
| ORPHAN 1624690 · TMA926306 | Blackmore Co. Inc. | 20 Furniture21 Housewares | Registered | 2016 |
| OROFINO 1345415 · TMA712032 | OROFINO VINEYARD INC. | 33 Wine40 Treatment | Registered | 2008 |
| OROPON 0077785 · TMDA17979 · design | ROHM & HAAS COMPANY | 1 Chemicals | Registered | 1913 |
| ORIBON 2066864 · TMA1133432 | ORIND SPECIAL REFRACTORIESPVT. LTD. | 19 Building | Registered | 2022 |
| ORAFINA 1965039 · TMA1228596 | an individual | 14 Jewellery | Registered | 2024 |
| ORBIUM 1925105 · TMA1118986 | ABAHOUSE INTERNATIONAL CO. | 25 Clothing | Registered | 2022 |
| ORIBAIN 1893547 · TMA1102303 | Toyo Ink SC Holdings Co. Ltd. | 1 Chemicals | Registered | 2021 |
| OrVance 1878903 · TMA1077789 | OrVance, LLC | 10 Medical | Registered | 2021 |
| OURPM 1869696 · TMA1047767 | Six Degrees Worldwide Inc. | 41 Education | Registered | 2019 |
| ÖRBEN 1807994 · TMA1010143 | Travel Plus International LLC | 9 Electronics18 Leather25 Clothing | Registered | 2018 |
| OURFAMILYWIZARD 1788445 · TMA1019876 | OurFamilyWizard, LLC | 38 Telecommunications42 Science45 Legal | Registered | 2019 |
| ORBIUM 1763523 · TMA1002400 | William Grant & Sons Irish Brands Limited | 33 Wine | Registered | 2018 |
| OREVEINS 1633138 · TMA924937 | OREVEINS SOFTWARE INC. a legal entity | 9 Electronics37 Construction41 Education+1 | Registered | 2016 |
| OROBIANCO 1371995 · TMA808766 · design | OROBIANCO SRL limited liability company | 18 Leather25 Clothing | Registered | 2011 |
| ORBENIN 0874262 · TMA541496 | GlaxoSmithKline LLC a Delaware limited liability company | 5 Pharmaceuticals | Registered | 2001 |
| ORBINOX 0802633 · TMA472380 · design | an individual | 7 Machines | Registered | 1997 |
| ORFFMOBILE 0774070 · TMA476024 | WENGER CORPORATION | 20 Furniture | Registered | 1997 |
| ORBAN 0728690 · TMA441364 | CRL Systems, Inc. (a Nevada corporation) | 7 Machines9 Electronics | Registered | 1995 |
| ORFOM 0483812 · TMA275457 | Chevron Phillips Chemical Company LP (a Delaware limited partnership) | 1 Chemicals | Registered | 1983 |
| ORBENIN 0273193 · TMA132483 | GlaxoSmithKline LLC a Delaware limited liability company | 5 Pharmaceuticals | Registered | 1963 |
| ORBION 2367160 · design | Orbion Apparel Inc / Vêtements Orbion Inc | 35 Advertising | Pending | 2024 |
| Orapink 2351623 | Quanzhou Dikai Network Technology Co. Ltd | 21 Housewares | Pending | 2024 |
| OROFIN 2331741 | OROFIN INC | 14 Jewellery | Pending | 2024 |
| ORVYNZA 2279633 | Owner not listed | 5 Pharmaceuticals | Pending | 2023 |