| Oasser 1875286 · TMA1084509 | DongGuan Sogoode Computer System Co. Ltd | 7 Machines9 Electronics11 Lighting+1 | Registered | 2020 |
| OSR 2083770 · TMA1212901 · design | ORIND SPECIAL REFRACTORIES PVT. LTD. | 19 Building | Registered | 2023 |
| OSIR 1832954 · TMA1008251 · design | an individual | 2 Paints | Registered | 2018 |
| OSCAR 1663988 · TMA940772 | Water Asset Management, Inc. | 9 Electronics37 Construction38 Telecommunications+1 | Registered | 2016 |
| OSR 1587213 · TMA867848 | OSR Open Systems Resources, Inc. | 41 Education42 Science45 Legal | Registered | 2013 |
| Oscar 1512158 · TMA861235 | Selecta Klemm GmbH & Co. KG | 31 Fresh | Registered | 2013 |
| OSCAR 0780640 · TMA491913 | Oscar de la Renta LLC | 3 Cosmetics | Registered | 1998 |
| OSCAR 0690704 · TMA408842 | Owner not shown | 29 Meat31 Fresh | Registered | 1993 |
| OSKAR 0609069 · TMA361884 · design | FREUDENBERG HOUSEHOLD PRODUCTS INC. faisant également affaires sous les dénominations PRODUITS MÉNAGERS FREUDENBERG INC. ou FHP INC. | 3 Cosmetics7 Machines9 Electronics+1 | Registered | 1989 |
| OSKAR 0609067 · TMA357855 | FREUDENBERG HOUSEHOLD PRODUCTS INC. faisant également affaires sous les dénominations PRODUITS MÉNAGERS FREUDENBERG INC. ou FHP INC. | 3 Cosmetics7 Machines9 Electronics+1 | Registered | 1989 |
| OSCAR 0586760 · TMA347886 | Owner not shown | 9 Electronics16 Paper41 Education | Registered | 1988 |
| OSKAR 0583424 · TMA352671 · design | FREUDENBERG HOUSEHOLD PRODUCTS INC. faisant également affaires sous les dénominations PRODUITS MÉNAGERS FREUDENBERG INC. ou FHP INC. | 21 Housewares | Registered | 1989 |
| OSKAR 0582570 · TMA348224 | FREUDENBERG HOUSEHOLD PRODUCTS INC. faisant également affaires sous les dénominations PRODUITS MÉNAGERS FREUDENBERG INC. ou FHP INC. | 21 Housewares | Registered | 1988 |
| OSKAR 0531222 · TMA310771 | Sunbeam Products, Inc. | 7 Machines8 Hand10 Medical+1 | Registered | 1986 |
| OSCAR 0520660 · TMA310662 · design | an individual | 9 Electronics35 Advertising | Registered | 1986 |
| OSCAR 0514225 · TMA302295 | an individual | 9 Electronics35 Advertising | Registered | 1985 |
| OSCAR+ 0406033 · TMA226976 | Owner not shown | 11 Lighting | Registered | 1978 |
| OSAR 2345985 | MARATHON WATCH COMPANY LTD. | 14 Jewellery | Pending | 2024 |
| OSCAR 2328502 · design | Owner not listed | 9 Electronics37 Construction42 Science+1 | Pending | 2023 |
| OSCAR 2048959 | Global Food and Ingredients Inc. | 31 Fresh | Pending | 2020 |
| Oscar 2007982 | KOOLATRON CORPORATION | 12 Vehicles21 Housewares27 Carpets | Pending | 2020 |
| OSCAR 0920465 | MCMASTER UNIVERSITY | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2010 |
| OSCAR 0918610 | MCMASTER UNIVERSITY | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2008 |
| OSCIR 0917771 | SUNNYBROOK HEALTH SCIENCES CENTRE | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2006 |
| OCCER 2261784 · TMA1281290 | Guangzhou Ruiyi Information Technology Co. Ltd. | 9 Electronics | Registered | 2025 |