| ORCAN 1893775 · TMA1102312 | an individual | 7 Machines9 Electronics11 Lighting+1 | Registered | 2021 |
| ORGANO 1619882 · TMA912999 | Organo Corporation | 7 Machines8 Hand11 Lighting+1 | Registered | 2015 |
| ORGANO 0691065 · TMA418167 · design | ORGANO KABUSHIKI KAISHA, (ORGANO CORPORATION) | 7 Machines9 Electronics11 Lighting | Registered | 1993 |
| ORCANAGAN 2225625 | an individual | 9 Electronics21 Housewares25 Clothing+4 | Pending | 2022 |
| ORGANIST 2296249 · TMA1258585 | LG H&H Co., LTD. | 3 Cosmetics | Registered | 2024 |
| ORRSUM 2261342 · TMA1279577 | E J Orr Limited | 25 Clothing | Registered | 2024 |
| ORIGIN 2249361 · TMA1268668 | Owner not listed | 28 Toys | Registered | 2024 |
| ORIGINS 2242991 · TMA1258449 | ORIGINS NATURAL RESOURCES INC. | 9 Electronics | Registered | 2024 |
| ORIJOYNA 2220851 · TMA1248536 | Shenzhen Xinge Trading Co. Ltd | 21 Housewares | Registered | 2024 |
| ORAGEN 2215717 · TMA1238958 | an individual | 5 Pharmaceuticals | Registered | 2024 |
| OrganiCAN 2207868 · TMA1247506 | OrganiCAN Ltd. | 3 Cosmetics5 Pharmaceuticals35 Advertising | Registered | 2024 |
| Originleaf 2207021 · TMA1246441 | Shenzhen Yuandianjiaye Technology Co.,Ltd | 35 Advertising | Registered | 2024 |
| 483 ORIGINAL 2199151 · TMA1275927 · design | an individual | 18 Leather25 Clothing35 Advertising | Registered | 2024 |
| ORIGINATION 2145241 · TMA1215255 | BANDAI NAMCO Entertainment America Inc. | 9 Electronics28 Toys41 Education | Registered | 2023 |
| ORGANICA 2137128 · TMA1201463 · design | an individual | 23 Yarns | Registered | 2023 |
| orijinative 2118785 · TMA1185205 | an individual | 35 Advertising36 Finance | Registered | 2023 |
| ORIGIN 2116514 · TMA1161595 | Stratasys, Inc. | 7 Machines | Registered | 2023 |
| ORIZON 2114585 · TMA1205018 · design | an individual | 5 Pharmaceuticals9 Electronics10 Medical | Registered | 2023 |
| Origyna 2106982 · TMA1177666 | Viridian Food Ltd. | 1 Chemicals29 Meat | Registered | 2023 |
| ORGANIKA 2103009 · TMA1223371 · design | SIDEROUS HOLDING LIMITED | 33 Wine | Registered | 2024 |
| ORIZON 2101581 · TMA1204975 | an individual | 5 Pharmaceuticals9 Electronics10 Medical | Registered | 2023 |
| Organoid 2094567 · TMA1216047 | Organoid Technologies GmbH | 20 Furniture24 Textiles27 Carpets | Registered | 2023 |
| ORIZON 2088415 · TMA1186050 | an individual | 25 Clothing | Registered | 2023 |
| ORIGEN 2081362 · TMA1252085 | FIORE FOODS 2426657 ONTARIO LTD | 29 Meat30 Coffee | Registered | 2024 |
| Organomi 2074208 · TMA1162471 | Owner not shown | 21 Housewares | Registered | 2023 |