| IDEOS 2037581 · TMA1121713 | C. JOSEF LAMY GMBH | 16 Paper | Registered | 2022 |
| IDEXX 1936118 · TMA1088868 · design | IDEXX LABORATORIES, INC. | 1 Chemicals5 Pharmaceuticals9 Electronics+4 | Registered | 2020 |
| idesk 1641553 · TMA1002270 | Cherry Man Industries, Inc. | 20 Furniture | Registered | 2018 |
| IDEAS 1544332 · TMA884030 · design | Ideas for Independent Living Inc. | 9 Electronics10 Medical12 Vehicles+4 | Registered | 2014 |
| IDEOS 1476404 · TMA833850 | HUAWEI TECHNOLOGIES CO., LTD. | 9 Electronics20 Furniture | Registered | 2012 |
| IDIGI 1465659 · TMA804967 · design | Digi International Inc. a Delaware Corporation | 9 Electronics37 Construction38 Telecommunications+4 | Registered | 2011 |
| IDIGI 1446339 · TMA803204 | Digi International Inc. a Delaware Corporation | 9 Electronics37 Construction40 Treatment+2 | Registered | 2011 |
| IDEXX 1358625 · TMA746302 | IDEXX LABORATORIES, INC. | 1 Chemicals5 Pharmaceuticals9 Electronics+2 | Registered | 2009 |
| IDEC 1275053 · TMA725843 · design | IDEC CORPORATION | 7 Machines9 Electronics11 Lighting | Registered | 2008 |
| IDEAS 0898991 · TMA563512 | Smith International, Inc. | 37 Construction38 Telecommunications41 Education+2 | Registered | 2002 |
| IDEX 0651454 · TMA412752 | IDEX CORPORATION | 6 Metal7 Machines20 Furniture | Registered | 1993 |
| IDEXX 0630445 · TMA400378 | IDEXX LABORATORIES, INC. | 1 Chemicals9 Electronics10 Medical | Registered | 1992 |
| IDEC 0418691 · TMA233071 | IDEC CORPORATION | 9 Electronics11 Lighting | Registered | 1979 |
| IDECO 0242814 · TMA111111 | an individual | 6 Metal7 Machines28 Toys | Registered | 1958 |
| IDEAS 2342662 | Campana Building Consultants LLC | 37 Construction42 Science | Pending | 2024 |
| IDEAS 2252200 | Owner not listed | 28 Toys | Pending | 2023 |
| IDG 2113474 · design | INTERNATIONAL DATA GROUP, INC. | 35 Advertising41 Education42 Science | Pending | 2021 |
| IDEAS 0922519 | Canadian Broadcasting Corporation / Société Radio-Canada | 1 Chemicals2 Paints3 Cosmetics+42 | Pending | 2013 |
| ITC 2205100 · TMA1240141 · design | Guangzhou BaoLun Electronics Co., Ltd | 38 Telecommunications | Registered | 2024 |
| ITASA 2203388 · TMA1225455 · design | Owner not shown | 16 Paper | Registered | 2024 |
| iTag 2188293 · TMA1269799 | Position Imaging, Inc. | 9 Electronics | Registered | 2024 |
| ITC 2181604 · TMA1259473 | Memphis Wood Fire Grills, LLC | 11 Lighting | Registered | 2024 |
| IDX 2133571 · TMA1176692 | Identity Theft Guard Solutions, Inc. | 9 Electronics35 Advertising38 Telecommunications+2 | Registered | 2023 |
| ITHACA 2089315 · TMA1223597 · design | SANOFI | 42 Science | Registered | 2024 |
| ITK. 2087927 · TMA1254709 | Yahoo Inc. | 35 Advertising | Registered | 2024 |