| OVERLOAD 1887464 · TMA1061538 | Mystery Ranch, LLC | 18 Leather | Registered | 2019 |
| OVERLAND 1822641 · TMA1030222 · design | Guangdong Overland Ceramics Co. Ltd. | 19 Building | Registered | 2019 |
| OVERLAND 1808626 · TMA1053776 | Delta Faucet Company | 11 Lighting | Registered | 2019 |
| OVERLAND 0990656 · NFLD656 · design | FCA US LLC | 7 Machines12 Vehicles | Registered | 1917 |
| OVERLAND 0850779 · TMA554194 | FCA US LLC | 12 Vehicles16 Paper | Registered | 2001 |
| OVERLAND 2314015 | an individual | 10 Medical44 Medical | Pending | 2023 |
| OVERLAND 2291749 · design | Owner not listed | 19 Building | Pending | 2023 |
| OVERLAND 2181531 | Overland Sheepskin Co. Inc. | 12 Vehicles16 Paper18 Leather+8 | Pending | 2022 |
| OVERLAPPER 0881721 · TMA547711 | CORR PAK MERCHANDISING INC. | 16 Paper | Registered | 2001 |
| OVERLOOK 2016342 · TMA1136408 | FCA US LLC | 12 Vehicles | Registered | 2022 |
| OVERLOOT 1939944 · TMA1159538 | Owner not shown | 28 Toys | Registered | 2023 |
| OVERLORD 0713640 · TMA430421 · design | OVERLORD, INC. | 9 Electronics | Registered | 1994 |
| OVERLANDER 1957484 · TMA1148602 | ADVENTURER MFG LIMITED PARTNERSHIP | 12 Vehicles | Registered | 2022 |
| OVERLANDER 0385174 · TMA215406 | Maple Leaf Foods Inc./Les Aliments Maple Leaf Inc. | 29 Meat | Registered | 1976 |
| Overlander 2315204 | Folding Mountain Brewing Ltd. | 16 Paper21 Housewares25 Clothing+1 | Pending | 2024 |
| OBERLY 2144048 · TMA1215227 | Shenzhen Daxun Trading Co. Ltd. | 7 Machines | Registered | 2023 |
| OBERLIN 1948588 · TMA1209146 · design | Production Service Company, Inc. AKA Oberlin Filter Company | 7 Machines11 Lighting | Registered | 2023 |
| OBERLO 1896968 · TMA1091999 · design | an individual | 9 Electronics35 Advertising39 Transport+1 | Registered | 2021 |
| OBERLO 1896967 · TMA1091998 | an individual | 9 Electronics35 Advertising39 Transport+1 | Registered | 2021 |
| OVERALL 1533393 · TMA893525 | an individual | 5 Pharmaceuticals | Registered | 2015 |
| OVRAL 0299478 · TMA151149 | Wyeth LLC a Delaware limited liability company | 5 Pharmaceuticals | Registered | 1967 |
| Operle 2295240 | an individual | 12 Vehicles26 Sewing | Pending | 2023 |
| OVERALL 2170888 | RUST-OLEUM CORPORATION, a legal entity | 2 Paints | Pending | 2022 |
| Offerland 2235917 · TMA1255403 | Offerland Technologies Inc | 42 Science | Registered | 2024 |
| Obraleigh 2130034 · TMA1192117 | 12822512 CANADA INC. | 12 Vehicles24 Textiles25 Clothing+2 | Registered | 2023 |