The Duetto buffo di due gatti ("humorous duet for two cats") is a popular performance piece for two sopranos which is often performed as a concert encore. The "lyrics" consist entirely of the repeated word "miau" ("meow"). Sometimes it is also performed by a soprano and a tenor, or a soprano and a bass.

While the piece is typically attributed to Gioachino Rossini, it was not actually written by him, but is instead a compilation written in 1825 that draws principally on his 1816 opera, Otello. Hubert Hunt putatively claims that the compiler was Robert Lucas de Pearsall, who for this purpose adopted the pseudonym "G. Berthold".