Sylvia Sass (born 12 July 1951) is a Hungarian operatic soprano who has sung leading roles both in her native country and internationally.
Born in Budapest, Hungary, she studied at Franz Liszt Academy of Music in Budapest with Ferenc Révhegyi. She made her professional debut at the Hungarian State Opera, as Frasquita in Georges Bizet's Carmen, in 1971. The following year, she appeared at the Sofia National Opera, as Violetta in La traviata, and during the 1974-75 season at the Salzburg Festival singing Mozart in concert.
In 1975, she sang at the Scottish Opera, as Desdemona in Verdi's Otello, and in 1976, made her debut at the Royal Opera House in London, in a performance as Giselda in I Lombardi, returning the following season as Violetta. In 1977, she made her only appearances at the Metropolitan Opera in New York, in Tosca (opposite José Carreras and Ingvar Wixell). She also appeared at the Vienna State Opera, the Munich State Opera, the Teatro Municipal de Caracas as Amelia in Un ballo in maschera, at the opera houses of Cologne, Frankfurt, Berlin, Hamburg, as well as the Paris Opera and the Aix-en-Provence Festival, both as Violetta. In 1978, she made her debut at the Teatro alla Scala in Milan, as Puccini's Manon Lescaut, conducted by Georges Prêtre, a performance that was televised live across Europe.