| ORILUX 1601937 · TMA914167 · design | FAIRLAND HOLDINGS CO. LTD | 1 Chemicals7 Machines9 Electronics+4 | Registered | 2015 |
| ORYLAG 0782678 · TMA487716 | Owner not shown | 16 Paper18 Leather25 Clothing | Registered | 1998 |
| ORIOLES 1290145 · TMA689042 | BALTIMORE ORIOLES LIMITED PARTNERSHIP. | 16 Paper25 Clothing41 Education | Registered | 2007 |
| ORALCDX 1034627 · TMA572756 · design | CDX Laboratories, Inc. | 9 Electronics10 Medical42 Science | Registered | 2002 |
| ORALCDX 1034626 · TMA555193 · design | CDX Laboratories, Inc. | 10 Medical16 Paper42 Science | Registered | 2001 |
| ORIOLES 0496489 · TMA337242 · design | BALTIMORE ORIOLES LIMITED PARTNERSHIP. | 9 Electronics16 Paper24 Textiles+4 | Registered | 1988 |
| orellis 2140784 · TMA1202803 | 8716510 canada inc. | 3 Cosmetics5 Pharmaceuticals | Registered | 2023 |
| orlusa 2099342 · TMA1175787 | Dongguan Miaofan Clothing Co. Ltd | 25 Clothing | Registered | 2023 |
| Oerlikon 2041308 · TMA1207001 | OC Oerlikon Corporation AG, Pfäffikon | 7 Machines9 Electronics37 Construction+1 | Registered | 2023 |
| OERLIKON 2036152 · TMA1206988 · design | OC Oerlikon Corporation AG, Pfäffikon | 7 Machines9 Electronics37 Construction+1 | Registered | 2023 |
| OERLIKON 1902468 · TMA1118409 | Lincoln Global, Inc. | 6 Metal7 Machines8 Hand+3 | Registered | 2022 |
| ORAELECTRIC 1867671 · TMA1052879 | an individual | 37 Construction | Registered | 2019 |
| Oerlikon 1856121 · TMA1092967 | OC Oerlikon Corporation AG, Pfäffikon | 1 Chemicals2 Paints6 Metal+2 | Registered | 2021 |
| OERLIKON 1856120 · TMA1092968 · design | OC Oerlikon Corporation AG, Pfäffikon | 1 Chemicals2 Paints6 Metal+2 | Registered | 2021 |
| ORILISSA 1812683 · TMA1027020 | AbbVie Inc. | 5 Pharmaceuticals | Registered | 2019 |
| OERLIKON 1783357 · TMA1135941 · design | OC Oerlikon Corporation AG, Pfäffikon | 1 Chemicals6 Metal40 Treatment | Registered | 2022 |
| OERLIKON 1783351 · TMA1135940 | OC Oerlikon Corporation AG, Pfäffikon | 1 Chemicals6 Metal40 Treatment | Registered | 2022 |
| Oerlikon 1357892 · TMA814599 | OC Oerlikon Corporation AG, Pfäffikon | 6 Metal17 Rubber19 Building | Registered | 2011 |
| OERLIKON 1354702 · TMA814598 · design | OC Oerlikon Corporation AG, Pfäffikon | 6 Metal7 Machines9 Electronics+6 | Registered | 2011 |
| OERLIKON 1348555 · TMA914690 | OC Oerlikon Corporation AG, Pfäffikon | 7 Machines9 Electronics11 Lighting+6 | Registered | 2015 |
| ORLACO 1343351 · TMA707950 | an individual | 9 Electronics | Registered | 2008 |
| OERLIKON 1311282 · TMA914686 · design | OC Oerlikon Corporation AG, Pfäffikon | 1 Chemicals2 Paints4 Oils+6 | Registered | 2015 |
| OERLIKON 1311279 · TMA916533 | OC Oerlikon Corporation AG, Pfäffikon | 1 Chemicals2 Paints4 Oils+8 | Registered | 2015 |
| OERLIKON 1297980 · TMA751816 · design | Lincoln Global, Inc. | 6 Metal7 Machines8 Hand+2 | Registered | 2009 |
| ORALCHROMA 1149795 · TMA614385 · design | Nissha Co. Ltd. | 10 Medical | Registered | 2004 |