Sylvia Sass (born 12 July 1951) is a Hungarian operatic soprano who has sung leading roles both in her native country and internationally.

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 1978, she made her debut at the Teatro alla Scala in Milan, as Puccini's Manon Lescaut (with Plácido Domingo), conducted by Georges Prêtre and directed by Piero Faggioni, a performance that was televised live across Europe.

Her repertory also included Donna Anna in Don Giovanni, Fiordiligi in Così fan tutte, Mimi in La bohème, Judith in Béla Bartók's Bluebeard's Castle, etc., but she was particularly noted in early Verdi operas, especially as Lady Macbeth.

Sass has made several recordings of arias, Lieder, and complete operas, notably Bluebeard's Castle and Don Giovanni, both conducted by Sir Georg Solti, Verdi's I Lombardi, Ernani, Attila, Macbeth, Stiffelio, all conducted by Lamberto Gardelli, as well as Cherubini's Médée (in the Italian version), again with Gardelli, Richard Strauss's Four Last Songs and Richard Wagner's Wesendonck Lieder.