| ORTHOSIT 1944336 · TMA1103445 | an individual | 5 Pharmaceuticals10 Medical | Registered | 2021 |
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| ORTHOSORB 0580426 · TMA358878 | Owner not shown | 10 Medical | Registered | 1989 |
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| ORTHOSONIC 1585676 · TMA954299 | SmileSonica Inc. | 10 Medical35 Advertising44 Medical | Registered | 2016 |
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| ORTHOGRAFT 0513573 · TMA301939 | DePuy Synthes, Inc. | 5 Pharmaceuticals | Registered | 1985 |
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| ORTHOCOMFOOT 2191961 · TMA1254939 · design | an individual | 25 Clothing | Registered | 2024 |
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| Orthogon 2011638 · TMA1199782 | Frequentis Orthogon GmbH | 9 Electronics35 Advertising37 Construction+1 | Registered | 2023 |
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| ORTHOCAST 1950884 · TMA1187991 | Dr. Amit Atrey Professional Corporation | 38 Telecommunications41 Education | Registered | 2023 |
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| ORTHOCORD 1224873 · TMA701023 | Owner not shown | 10 Medical | Registered | 2007 |
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| ORTHOSS 1222691 · TMA769880 | Owner not shown | 5 Pharmaceuticals | Registered | 2010 |
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| ORTHOSTYLE 1727531 · TMA967380 | Dr. Larry Podolsky Dental Corporation | 3 Cosmetics41 Education44 Medical | Registered | 2017 |
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| Ortsoon 2245277 · TMA1264389 | Huizhou Xinxiao Network Technology Co. Ltd | 21 Housewares | Registered | 2024 |
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| ORTHUS 2240319 · TMA1234028 | DYZE DESIGN INC. | 9 Electronics | Registered | 2024 |
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| ORTHOKINE 1495074 · TMA832809 | an individual | 3 Cosmetics5 Pharmaceuticals10 Medical | Registered | 2012 |
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| ORTHOGEL 0769208 · TMA450305 | Clinique Lafontaine Inc. | 5 Pharmaceuticals9 Electronics | Registered | 1995 |
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| ORTHOZIME 0726600 · TMA435718 | THE RUHOF CORPORATION | 5 Pharmaceuticals | Registered | 1994 |
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| ORTHOCEPH 0650718 · TMA387522 | an individual | 10 Medical | Registered | 1991 |
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| ORTHOCRYL 0532815 · TMA327572 | DENTAURUM GmbH & Co. KG | 1 Chemicals2 Paints5 Pharmaceuticals | Registered | 1987 |
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| ORTHOCURE 0522921 · TMA307892 | an individual | 3 Cosmetics30 Coffee | Registered | 1985 |
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| OrthoCare 2362519 | NAKA HERBS & VITAMINS LTD. | 5 Pharmaceuticals | Pending | 2024 |
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| OrthoCan 2357312 | NAKA HERBS & VITAMINS LTD. | 5 Pharmaceuticals | Pending | 2024 |
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| ORTHOCLUB 1966776 | G & H Wire Company, Inc. | 35 Advertising | Pending | 2019 |
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| ORTHOSEARCH 2139810 · TMA1219761 | The British Editorial Society of Bone and Joint Surgery | 9 Electronics41 Education42 Science | Registered | 2024 |
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| ORTHOSMILES 1765897 · TMA1004055 · design | ORTHOSMILES HOLDING COMPANY | 3 Cosmetics5 Pharmaceuticals9 Electronics+10 | Registered | 2018 |
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| ORTHOSMILES 1765896 · TMA1004056 | ORTHOSMILES HOLDING COMPANY | 3 Cosmetics5 Pharmaceuticals9 Electronics+10 | Registered | 2018 |
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| ORTHOACCEL 1770235 · TMA975605 | ORTHOACCEL HOLDINGS, LLC | 10 Medical | Registered | 2017 |
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