A button accordion is a type of accordion on which the melody-side keyboard consists of a series of buttons. This differs from the piano accordion, which has piano-style keys. Erich von Hornbostel and Curt Sachs categorize it as a free reed aerophone in their classification of instruments, published in 1914. The sound from the instrument is produced by the vibration of air in reeds. Button accordions of various types are particularly common in European countries and countries where European people settled. The button accordion is often confused with the concertina; the button accordion's buttons are on the front of the instrument, where as the concertina's are on the sides and pushed in parallel with the bellows.

Sharon Shannon is an Irish musician, best known for her work with the button accordion and for her fiddle technique. She also plays the tin whistle and melodeon. Her 1991 debut album, Sharon Shannon, was the best-selling album of traditional Irish music ever released in Ireland. Beginning with Irish folk music, her work demonstrates a wide-ranging number of musical influences. She won the lifetime achievement award at the 2009 Meteor Awards.