William Tell is a French-language opera in four acts by Italian composer Gioachino Rossini to a libretto by Victor-Joseph Étienne de Jouy and L. F. Bis, based on Friedrich Schiller's play Wilhelm Tell, which, in turn, drew on the William Tell legend. The opera was Rossini's last, although he lived for nearly 40 more years. Fabio Luisi said that Rossini planned for Guillaume Tell to be his last opera even as he composed it. The often-performed overture in four sections features a depiction of a storm and a vivacious finale, the "March of the Swiss Soldiers".

Gioachino Antonio Rossini was an Italian composer who gained fame for his 39 operas, although he also wrote many songs, some chamber music and piano pieces and some sacred music. He set new standards for both comic and serious opera before retiring from large-scale composition while still in his thirties, at the height of his popularity.