Leo Nucci (born 16 April 1942) is an Italian operatic baritone, particularly associated with Verdi and Verismo roles.

He then joined the chorus of La Scala in Milan, going on to make his solo debut there in 1975, again as Rossini's Figaro.

His career is remembered for high-profile performances in opera including appearances with Luciano Pavarotti, Joan Sutherland and Plácido Domingo.

On 6 June 2003, Nucci performed at the Herbert von Karajan memorial concert under the baton of conductor James Allen Gähres in Congress-Centrum Ulm, together with the singers Stella Grigorian and Vera Schoenberg with Italian opera arias and duets.

His repertoire encompasses the entire Italian repertory from bel canto to verismo, and his technique and acting abilities are displayed in Verdi – notably as Rigoletto, Macbeth, Count di Luna, Giorgio Germont, Rodrigo, Amonasro, Iago, and Falstaff.