| ROOTECH 1012163 · TMA541438 | Technaflora Plant Products Ltd. | 11 Lighting | Registered | 2001 |
| RHEOTEC 0568692 · TMA334511 | Foseco International Limited | 1 Chemicals | Registered | 1987 |
| RITEC 2052026 · TMA1152933 · design | RITEC Rohr-Inspektionstechnik GmbH | 9 Electronics41 Education42 Science | Registered | 2022 |
| REATEC 1855708 · TMA1058684 | Sangetsu Corporation | 17 Rubber19 Building27 Carpets | Registered | 2019 |
| ROTECC 1665223 · TMA963800 | Zoetis Services LLC | 44 Medical | Registered | 2017 |
| RETEC 1606981 · TMA888671 | SpilKleen, Division of AgraMax Inc. | 17 Rubber35 Advertising | Registered | 2014 |
| ROTECH 1296121 · TMA756600 | Sawgrass Technologies, Inc. | 2 Paints9 Electronics37 Construction+1 | Registered | 2010 |
| RODEC 1071472 · TMA549464 | Robbins & Myers Canada, Ltd. | 5 Pharmaceuticals6 Metal7 Machines+1 | Registered | 2001 |
| RODEC 1071471 · TMA549466 · design | Robbins & Myers Canada, Ltd. | 5 Pharmaceuticals6 Metal7 Machines+1 | Registered | 2001 |
| ROTEX 0877339 · TMA534219 | an individual | 7 Machines28 Toys | Registered | 2000 |
| RETEC 0787834 · TMA468625 · design | Rétec international inc. | 2 Paints3 Cosmetics7 Machines+2 | Registered | 1997 |
| ROTEX 0729462 · TMA449533 | ROTEX Heating Systems GmbH | 9 Electronics11 Lighting | Registered | 1995 |
| ROTEX 0631156 · TMA368690 | KTR Systems GmbH | 7 Machines | Registered | 1990 |
| ROTEK 0372550 · TMA205752 | thyssenkrupp rothe erde USA Inc. | 6 Metal7 Machines12 Vehicles+2 | Registered | 1975 |
| ROTEX 0096980 · TMDA25060 | Rotex Global, LLC | 7 Machines11 Lighting | Registered | 1919 |
| RYTES 2061109 | Omring Limited | 5 Pharmaceuticals9 Electronics30 Coffee+3 | Pending | 2020 |
| RHEOTECH 1151153 · TMA695558 | Owner not shown | 1 Chemicals | Registered | 2007 |
| REWITEC 2056537 · TMA1196402 | Rewitec GmbH | 1 Chemicals4 Oils42 Science | Registered | 2023 |
| RAWTECH 1776460 · TMA989713 · design | Nutraceutech Inc. | 11 Lighting | Registered | 2018 |
| ROWTECH 1719285 · TMA921851 | Loc Performance Products, LLC | 12 Vehicles | Registered | 2015 |
| ROADTEC 1189832 · TMA622890 | an individual | 12 Vehicles | Registered | 2004 |
| ROTESCO 0486630 · TMA275862 | ROTESCO LTD. | 6 Metal42 Science | Registered | 1983 |
| REWATEC 2172878 | Premier Tech Ltée/Premier Tech Ltd. | 6 Metal7 Machines9 Electronics+4 | Pending | 2022 |
| ROADTEC 2028602 | Roadtec, Inc. | 7 Machines12 Vehicles | Pending | 2020 |
| ROOTS 2231736 · TMA1248979 | Roots Corporation | 9 Electronics35 Advertising41 Education+1 | Registered | 2024 |