| OEIS 2074096 · TMA1162463 · design | ONTARIO EAGLEZ INVESTIGATIONS AND SECURITY SERVICES CORP. | 6 Metal45 Legal | Registered | 2023 |
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| OQCS 1884190 · TMA1081888 | an individual | 7 Machines9 Electronics12 Vehicles | Registered | 2020 |
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| OES 1854627 · TMA1091293 | OES Inc. | 9 Electronics42 Science | Registered | 2021 |
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| OEC 1700986 · TMA938652 | OEConnection LLC | 35 Advertising | Registered | 2016 |
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| OCS 1534601 · TMA846475 · design | Overseas Courier Service Co. Ltd. | 39 Transport | Registered | 2013 |
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| OEC 1209402 · TMA652652 | GE Precision Healthcare LLC | 10 Medical | Registered | 2005 |
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| OCS 0925289 · design | Ontario Cannabis Retail Corporation (OCRC) operating as the Ontario Cannabis Store (OCS) | All goods and services | Protected | 2018 |
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| OEC 0900988 | MINISTRY OF FINANCE | All goods and services | Protected | 1978 |
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| OES 0489311 · TMA284530 | Olympus Corporation | 9 Electronics10 Medical | Registered | 1983 |
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| OKCS 2368692 · design | Owner not listed | 3 Cosmetics | Pending | 2024 |
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| OES 2345646 | an individual | 9 Electronics16 Paper35 Advertising+1 | Pending | 2024 |
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| OEC 2201638 | Oakville Enterprises Corporation | 35 Advertising37 Construction39 Transport+1 | Pending | 2022 |
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| OEC 2163473 · design | S. J. ELECTRO SYSTEMS, INC. | 9 Electronics40 Treatment | Pending | 2022 |
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| OEC 2154682 | Omega Therapeutics, Inc. | 5 Pharmaceuticals | Pending | 2021 |
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| Okcsc 1904429 · TMA1092119 | Shenzhen EZBL Digital Technology Co. Limited | 9 Electronics | Registered | 2021 |
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| OACCS 1468613 · TMA826919 | Ontario Association of Credit Counselling Services a legal entity | 9 Electronics11 Lighting14 Jewellery+11 | Registered | 2012 |
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| OCU 2209120 · TMA1241686 | an individual | 36 Finance | Registered | 2024 |
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| OS 2205852 · TMA1275955 | an individual | 1 Chemicals3 Cosmetics4 Oils+3 | Registered | 2024 |
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| OCJ 2154798 · TMA1218280 | Guangzhou Athena Jewelry Co., Ltd. | 14 Jewellery | Registered | 2024 |
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| OAS 2138927 · TMA1246200 | OAS Company AB | 9 Electronics14 Jewellery18 Leather+2 | Registered | 2024 |
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| OCU 2057759 · TMA1130040 | Zipify, LLC | 42 Science | Registered | 2022 |
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| OHCO 2032531 · TMA1165376 | FFL Brands LLC | 10 Medical | Registered | 2023 |
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| OCI 1964266 · TMA1119950 | Siemens Healthcare GmbH | 9 Electronics16 Paper35 Advertising+1 | Registered | 2022 |
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| OCK 1888742 · TMA1064353 · design | an individual | 9 Electronics14 Jewellery18 Leather+1 | Registered | 2019 |
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| OQC 1884189 · TMA1081892 | an individual | 7 Machines9 Electronics12 Vehicles | Registered | 2020 |
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