| Rovtech Solutions Ltd | |
| Rowan Group | |
| Rowlands Electronics Ltd | Gwynedd |
| Rowley Associates Ltd | Gloucestershire |
| Rowse 4 Automation | Devon |
| Roy Barber | Nottinghamshire |
| Royal Academy of Engineering | |
| Royal Agricultural University | |
| Royal College of Art | |
| Royal College of Art - InnovationRCA | Greater London |
| Royal College of Physicians | |
| Royal College of Surgeons of England | |
| Royal Holloway University of London - Department of Information Security | Surrey |
| Royal Holloway, University of London | Greater London |
| Royal Holloway, University of London - Computer Learning Research Centre | Surrey |
| Royal Holloway, University of London - Computer Science | Surrey |
| Royal Holloway, University of London - Mathematics | Surrey |
| Royce Communications Ltd | Hampshire |
| RPA Distribution | Greater London |
| RPC Telecommunications Ltd | Suffolk |
| RQ Biotechnology | |
| RS Digital Marketing | |
| RS-IT Solutions Ltd | |
| RS2 Technologies Ltd | |
| RSA Creative Studio | |
| RSD Communications Ltd | Stirling |
| RSK Business Solutions | Kent |
| RSK Labs | |
| RSM Technology Ltd | Buckinghamshire |
| RT Web Designs | East Lothian |
| RU Robots Ltd | |
| Rua Life Sciences plc | |
| Rubber Dragon | Wiltshire |
| Rubber Duckers TM Ltd | |
| Rubicon Software Ltd | Surrey |
| Rubiqa | Derbyshire |
| Rubisoft | |
| Rubix Software | |
| Rudo | |
| RUFF Works | |
| Rujia Marketing Management | |
| Ruler Analytics Ltd | |
| Rumba Graphic Design | |
| Rumbl | Oxfordshire |
| Rumbler | |
| Rumpala Ltd | |
| Run Digital Ltd | |
| Run Viable Ltd | |
| Run2 | |
| Rungway | |