Salvatore Cardillo (20 February 1874 – 5 February 1947) was an Italian-American composer.
Born in Naples, he studied piano and composition in Italy before emigrating in 1903 to the United States as a university graduate.
His career encompassed songwriting and movie music.
He died in New York.
Cardillo's richly scored and still popular 1911 romance Core 'ngrato (Ungrateful Heart) — also known by its lyric Catarì, Catarì, pecchè me dici sti parole amare — was written in America to a text in Neapolitan dialect by Alessandro Sisca; it is in fact the only famous Neapolitan song by an Italian-American immigrant.
The song's first exponent was the operatic tenor Enrico Caruso, but it is not clear whether he commissioned it.