| ORIDO 1444568 · TMA788073 · design | NEWLIGHTING ELECTRONICS CO. LTD. | 9 Electronics | Registered | 2011 |
| ORYEDA 2250728 · TMA1270035 | Owner not listed | 18 Leather | Registered | 2024 |
| OREDIA 2152979 · TMA1189929 | NIHON NOHYAKU CO. LTD. | 5 Pharmaceuticals | Registered | 2023 |
| oredy 2107657 · TMA1191772 | Ruian Outong Auto Parts Co. Ltd. | 12 Vehicles | Registered | 2023 |
| ORTHO2 2014574 · TMA1275194 | Ortho2, LLC | 9 Electronics | Registered | 2024 |
| oreato 1950313 · TMA1128012 | an individual | 1 Chemicals2 Paints3 Cosmetics+41 | Registered | 2022 |
| ORETTA 1824147 · TMA1071297 | Oretta Hospitality Inc. | 29 Meat30 Coffee31 Fresh+4 | Registered | 2020 |
| ORTHO 1672991 · TMA983087 · design | OMS Investments, Inc. | 5 Pharmaceuticals | Registered | 2017 |
| ORTHO 1600302 · TMA920116 · design | OMS Investments, Inc. | 1 Chemicals5 Pharmaceuticals7 Machines+3 | Registered | 2015 |
| ORTHO 1600299 · TMA920117 · design | OMS Investments, Inc. | 5 Pharmaceuticals21 Housewares | Registered | 2015 |
| ORATIO 1475785 · TMA809221 | Technologies Humanware Inc. | 9 Electronics | Registered | 2011 |
| ORIDAO 1468868 · TMA814434 · design | Owner not shown | 9 Electronics37 Construction38 Telecommunications+1 | Registered | 2011 |
| ORTA 1431846 · TMA767203 | GROUPE SEB CANADA INC. | 11 Lighting21 Housewares | Registered | 2010 |
| ORTHO 1422658 · TMA783369 · design | OMS Investments, Inc. | 5 Pharmaceuticals8 Hand21 Housewares | Registered | 2010 |
| ORTA 1257565 · TMA674914 · design | Oak Ridges Trail Association | 16 Paper25 Clothing26 Sewing+3 | Registered | 2006 |
| ORTHO 0489637 · TMA278327 | Owner not shown | 5 Pharmaceuticals10 Medical | Registered | 1983 |
| ORTHO 0446734 · TMA264619 · design | Owner not shown | 1 Chemicals3 Cosmetics5 Pharmaceuticals+2 | Registered | 1981 |
| ORTHO 0364160 · TMA197504 · design | JOHNSON & JOHNSON (A NEW JERSEY CORPORATION) | 1 Chemicals3 Cosmetics5 Pharmaceuticals+5 | Registered | 1974 |
| OROWEAT 0326463 · TMA177566 | Owner not shown | 30 Coffee | Registered | 1971 |
| ORTHO 0218253 · UCA43987 · design | JOHNSON & JOHNSON (A NEW JERSEY CORPORATION) | 5 Pharmaceuticals10 Medical16 Paper+1 | Registered | 1953 |
| ORTHO 0206393 · UCA43408 | JOHNSON & JOHNSON (A NEW JERSEY CORPORATION) | 1 Chemicals3 Cosmetics5 Pharmaceuticals+3 | Registered | 1950 |
| ORTHO 0202561 · UCA33407 | OMS Investments, Inc. (a Delaware corporation) | 1 Chemicals5 Pharmaceuticals | Registered | 1949 |
| OERTH 2295987 | Oerth Bio, LLC | 5 Pharmaceuticals42 Science | Pending | 2023 |
| ORDO 2243032 | Owner not listed | 9 Electronics42 Science | Pending | 2023 |
| Ordo 2241208 | Ordo IP Limited | 3 Cosmetics5 Pharmaceuticals21 Housewares | Pending | 2022 |