Eponyms beginning with R
- Reynolds' syndrome (Telfer B. Reynolds)
- Reynolds-Neri-Herrmann syndrome (James F. Reynolds)
- Rheinhard's myocarditis
- Ribbing's disease
- Ribbing's syndrome or disease
- Ribbing-Müller disease
- Ricci-Cacchi syndrome
- Rich's phenomenon
- Richardson-Kirk syndrome
- Richet's phenomenon
- Richet's phenomenon
- Richner's syndrome
- Richner-Hanhart syndrome
- Richter's hernia
- Richter's line
- Richter-Littre hernia
- Richter-Littre hernia
- Rickettsia
- Rickettsia prowazeki
- Rickettsia prowazeki
- Rickettsia typhi
- Rickettsial disease
- Rickettsicidal
- Rickettsiosis
- Riddoch's syndrome I