| RAC PLC | Bourne End |
| RAC Auto Windscreens Ltd | Chesterfield |
| The Racecourse Association Ltd (RCA) | Ascot |
| Racing UK | London |
| Racing UK | London |
| Radio Forth | Edinburgh |
| Radio Society of Great Britain | Potters Bar |
| Radio Times | London |
| The RadioCentre | London |
| RAF Careers | Cardiff |
| Raisin Social Ltd | Godstone |
| Raleigh UK Ltd | Nottingham |
| The Ramblers' Association | London |
| The Ramblers' Association Scotland | Kinross |
| The Raven Group | London |
| RB Communications | Twickenham |
| RCL Media Ltd | London |
| RDA Communications Ltd | London |
| RDF Group | Brighton |
| REACH | London |
| Real Radio | Glasgow |
| The Really Useful Group Ltd | London |
| Reckitt Benckiser plc | Slough |
| Red Bull | London |
| The Red Consultancy | London |
| Red Funnel Ferries | Southampton |
| Redcats (UK) | Bradford |
| redmandarin | London |
| Redrow PLC | Deeside |
| Reebok UK Ltd | Lancaster |
| Reed Elsevier Group plc | London |
| Reed Executive Plc | London |
| Referees' Association | Coventry |
| Renault UK Ltd | Rickmansworth |
| Rentokil Initial plc | London |
| Reprotec Office Solutions Ltd | Nottingham |
| Resolution Asset Management Ltd | Glasgow |
| Resource | Ballymena |
| Revlon International UK | London |
| Revolution Sports Marketing Group Ltd | Arundel |
| Rhino Marketing | London |
| Rhino Rugby Ltd | London |
| RIAS plc | Bournemouth |
| Richemont Holdings (UK) Ltd | London |
| Rickerbys | Cheltenham |
| Ricoh (UK) Ltd | Feltham |
| Riding for the Disabled Association | Warwick |
| Rizla UK Ltd | Bristol |
| Robert Cain & Company Ltd | Liverpool |
| Robert Wiseman Dairies plc | Glasgow |
| Rockley Watersports Ltd | Poole |
| Rockport | Stockport |
| Rodenstock UK | Gravesend |
| Rolex UK | London |
| Rolls-Royce plc | London |
| Rosehill Press Ltd | Rotherham |
| The Royal & Ancient Golf Club of St Andrews | St Andrews |
| Royal & SunAlliance Insurance | London |
| Royal Aero Club of the United Kingdom | Leamington Spa |
|
Royal Albert Hall | London |
| The Royal Bank of Scotland Group plc | Edinburgh |
| Royal Caledonian Curling Club (RCCC) | Newbridge |
| Royal Geographical Society (RGS) | London |
| Royal Institute of British Architects (RIBA) | London |
| Royal London Group | London |
| Royal Mail Group plc | London |
|
Royal Ocean Racing Club (RORC) | London |
| The Royal Photographic Society (RPS) | Bath |
|
Royal Scottish Academy of Art & Architecture (RSA) | Edinburgh |
| The Royal Society for the Encouragement of Arts, Manufacture & Commerce (RSA) | London |
| Royal Television Society (RTS) | London |
| Royal Yachting Association (RYA) | Southampton |
| RPMC Europe Ltd | London |
| RT Marketing Ltd | Richmond |
| The Rugby Fives Association (RFA) | London |
|
The Rugby Football League (RFL) | Leeds |
| Rugby Football Union (RFU) | Twickenham |
| Rugby Football Union for Women (RFUW) | Twickenham |
| Ruralnet UK | Kenilworth |
| RWE npower | Worcester |
| RYA Windsurfing | Southampton |
| Ryanair | Co Dublin |
| Ryden | Edinburgh |
| Ryman the Stationer | Crewe |
