| OBJECTSCALE 2053139 · TMA1282111 | Dell Inc. | 9 Electronics42 Science | Registered | 2025 |
| OBJECTIVESPARK 1727704 · TMA939282 | ObjectiveSpark Inc. | 9 Electronics38 Telecommunications41 Education+1 | Registered | 2016 |
| OBJECTIFMD 1974487 · TMA1126871 | THE BANK OF NOVA SCOTIA | 9 Electronics35 Advertising36 Finance+2 | Registered | 2022 |
| OBJECTWAY 1824538 · TMA1024702 | an individual | 9 Electronics41 Education42 Science | Registered | 2019 |
| OBJECT 1816446 · TMA1066450 | Ammunition, LLC | 9 Electronics | Registered | 2019 |
| OBJECTADA 1384425 · TMA855452 | ATEGO GROUP LIMITED | 9 Electronics41 Education42 Science | Registered | 2013 |
| OBJECTVIDEO 1259585 · TMA716950 | ObjectVideo Labs, LLC | 9 Electronics42 Science45 Legal | Registered | 2008 |
| OBJECTIVITY 0865221 · TMA513775 | OBJECTIVITY, INC. (A CALIFORNIA CORPORATION) | 9 Electronics42 Science | Registered | 1999 |
| ObjectMetrics 1546592 · TMA829802 | Motion Metrics International Corp. | 9 Electronics35 Advertising37 Construction+3 | Registered | 2012 |
| OBJECTWINDOWS 0674546 · TMA443797 | MICROSOFT CORPORATION, A WASHINGTON CORPORATION | 9 Electronics | Registered | 1995 |
| OPIZAZZ 2245203 · TMA1263241 | Owner not listed | 5 Pharmaceuticals | Registered | 2024 |
| OBJECTIVEHEALTH 2155962 · TMA1192169 | ObjectiveGI, Inc. | 42 Science | Registered | 2023 |
| OBASISABO 2152105 · TMA1188825 · design | an individual | 16 Paper25 Clothing | Registered | 2023 |
| OVEKOS 2146889 · TMA1204091 · design | quanzhoukaiqing Electronic Commerce Co. Ltd. | 25 Clothing | Registered | 2023 |
| OfficeCastle 2133031 · TMA1195853 | an individual | 16 Paper | Registered | 2023 |
| OVOSICARE 2114591 · TMA1226804 · design | Owner not shown | 5 Pharmaceuticals | Registered | 2024 |
| OPAZZUS 2023197 · TMA1153980 | REGENERON PHARMACEUTICALS, INC. | 5 Pharmaceuticals | Registered | 2022 |
| OBSESSO 2020592 · TMA1144534 · design | Owner not shown | 29 Meat30 Coffee32 Beer | Registered | 2022 |
| OBSESSION 2014498 · TMA1144491 | Canada Bread Company, Limited | 30 Coffee | Registered | 2022 |
| OBSESSIVE 1995741 · TMA1112627 · design | Owner not shown | 25 Clothing35 Advertising | Registered | 2021 |
| OFFICESTOCK 1927840 · TMA1151096 | 9381961 Canada Inc. | 35 Advertising | Registered | 2022 |
| OBSESSEE 1880625 · TMA1116123 | FUTURE US LLC | 3 Cosmetics8 Hand21 Housewares | Registered | 2021 |
| OBSESSED 1843670 · TMA1055465 · design | CALVIN KLEIN COSMETIC CORPORATION | 3 Cosmetics | Registered | 2019 |
| OBJEQ 1830841 · TMA1001306 | an individual | 9 Electronics | Registered | 2018 |
| OBSESSEE 1786663 · TMA1060703 | FUTURE US LLC | 18 Leather25 Clothing35 Advertising+6 | Registered | 2019 |