Cancer Organizations: R
- Royal Shrewsbury Hospital
- Royal South Hants Hospital
- Royal United Hospital
- Royal University Hospital
- Royal University Hospital
- Royal Victoria Hospital
- Royal Victoria Hospital
- Royal Victoria Hospital - Montreal
- Royal Victoria Hospital of Barrie
- Royal Victorian Eye and Ear Hospital
- Royal Women's Hospital
- Ruby L. Golleher Cancer Program at Presbyterian Intercommunity Hospital
- Ruby Memorial Hospital
- Rudolfinerhaus
- Rui Jin Hospital
- Rumah Sakit Sanglah
- Ruppiner Klinikum GMBH
- Ruprecht - Karls - Universitaet Heidelberg
- Rush Cancer Institute at Rush University Medical Center
- Rush Memorial Hospital
- Rush North Shore Medical Center
- Rush Oak Park Hospital
- Rush University Medical Center
- Rush-Copley Cancer Care Center
- Rush-Riverside Cancer Institute at Riverside Medical Center
- Russells Hall Hospital
- Russellton Medical Group
- Russian Academy of Medical Sciences Cancer Research Center
- Russian Research Center for Roentgen Radiology
- Russian State Medical University
- Rutgers, The State University of New Jersey
- Ruth G. McMillan Cancer Center at Greene Memorial Hospital
- Rutherford Hospital
- Rutherford Internal Medicine Associates, PA
- Rutherford Surgical Associates
- Rutland Surgical Associates
- Ruttenberg Cancer Center at Mount Sinai Medical Center
- Ruwaard Van Putten Ziekenhuis
- Ryazan Regional Clinical Oncology Center
- Ryerson University
- Ryukyu University Hospital
