| OTELO 0791515 · TMA511513 | o.tel.o communications GmbH & Co. | 9 Electronics35 Advertising37 Construction+1 | Registered | 1999 |
| OTELLO 1266948 · TMA688657 | Owner not shown | 30 Coffee | Registered | 2007 |
| OATLY 2166969 · TMA1232332 | an individual | 9 Electronics29 Meat31 Fresh+2 | Registered | 2024 |
| ODELO 2018320 · TMA1138507 · design | odelo GmbH | 11 Lighting12 Vehicles42 Science | Registered | 2022 |
| OATLY 1849382 · TMA1179771 | an individual | 5 Pharmaceuticals9 Electronics14 Jewellery+11 | Registered | 2023 |
| OATLY 1820937 · TMA1030544 | an individual | 29 Meat30 Coffee32 Beer | Registered | 2019 |
| OTL 1520635 · TMA869783 | GOUVERNEUR INC. | 35 Advertising36 Finance37 Construction+4 | Registered | 2014 |
| OATLY 1389664 · TMA795313 | an individual | 29 Meat | Registered | 2011 |
| ODLO 0396387 · TMA224659 | an individual | 25 Clothing | Registered | 1977 |
| ODLO 2262661 | Owner not listed | 12 Vehicles18 Leather25 Clothing+1 | Pending | 2023 |
| OTHELLO 1979815 · TMA1133791 · design | Maitland-Othello GmbH | 7 Machines11 Lighting21 Housewares | Registered | 2022 |
| OTTELLA 1862625 · TMA1022365 · design | Owner not shown | 33 Wine | Registered | 2019 |
| Othello 1797819 · TMA1024883 | Kabushiki Kaisha MegaHouse (MegaHouse Corporation) | 9 Electronics38 Telecommunications41 Education | Registered | 2019 |
| OTHELLO 1446388 · TMA772101 | DOMINUS ESTATE CORPORATION | 33 Wine | Registered | 2010 |
| OTHELLO 1328855 · TMA839895 | Kabushiki Kaisha MegaHouse (MegaHouse Corporation) | 28 Toys | Registered | 2013 |
| OTHELLO 0217208 · UCA45771 | Schwan-Stabilo Schwanhäußer GmbH & Co. KG | 2 Paints16 Paper | Registered | 1952 |
| OTWILLO 2166207 | OT4B | 5 Pharmaceuticals10 Medical | Pending | 2022 |
| ODWALLA 2197711 · TMA1242580 | Full Sail IP Brandco 1, LLC | 5 Pharmaceuticals29 Meat30 Coffee+2 | Registered | 2024 |
| Outill 2121413 · TMA1198792 | Foshan Ailuoke Furniture Co. Ltd. | 28 Toys | Registered | 2023 |
| ODELE 2042962 · TMA1123197 | ODELE, LLC | 3 Cosmetics | Registered | 2022 |
| ODLA 2003288 · TMA1147645 · design | an individual | 9 Electronics15 Musical28 Toys | Registered | 2022 |
| OUTLAW 1969034 · TMA1255696 | S.F. MARKETING INC. | 9 Electronics15 Musical | Registered | 2024 |
| OTELIA 1782425 · TMA978384 · design | an individual | 5 Pharmaceuticals29 Meat30 Coffee+2 | Registered | 2017 |
| OUTLAW 1781652 · TMA1059696 | THOR TECH, INC. | 12 Vehicles | Registered | 2019 |
| OWTEL 1775584 · TMA986385 · design | One World Telecommunications Holdings Limited | 9 Electronics38 Telecommunications | Registered | 2017 |