•
Johnny Sansone (born 1957) •
William Schimmel (born 1946) – accordionist, composer and philosopher •
John Serry Sr. (1915–2003) – classical and concert accordionist, free-bass accordionist •
Alexander Sevastian (1976–2018) – Russian-Canadian classical, concert, and classical crossover accordionist •
Jimmy Shand (1908–2000) – Scottish accordionist, made famous by his unique Scottish Country Dance Band and popularity for dances. •
Sharon Shannon (born 1968) – Irish accordionist •
Sivuca (1930–2006) – Brazilian musician •
Chango Spasiuk (born 1968) – Argentine folk musician of Ukrainian descent •
John Spiers (born 1975) – English melodeon player •
Will Starr (1922–1976) – Scottish accordionist, technically a genius and a true master of the button key accordion, famous for his expertise at playing every genre of music. Described as the true "Master of the Button Key Accordion" ==T==