Eponyms beginning with S
- Sydenham's chorea
- Sydenham’s disease
- Sydenham’s syndrome
- Syme's amputation
- Syme's operation
- Syme's operation II
- Syme's operation III
- Symonds-Shaw syndrome
- Symonds’ syndrome
- Syndrome d'Hutinel (French)
- Syndrome de Gerstmann (French)
- Syndrome de Kurt Mendel
- Syndrome de Martorell et Fabre-Tersoll (French),
- Syndrome de Munchausen par procuration (French)
- Syndrome de Pourfour du Petit (French)
- Syphiloma of Fournier
- Szent-Györgi's quotient
- Szent-Györgyi-Krebs cycle
- Sæthre-Chotzen syndrome