Nicolai Ghiaurov (or Nikolai Gjaurov, Nikolay Gyaurov, Bulgarian: Николай Гяуров) (September 13, 1929 – June 2, 2004) was a Bulgarian opera singer and one of the most famous basses of the postwar period. He was admired for his powerful, sumptuous voice, and was particularly associated with roles of Verdi. Ghiaurov married the Italian soprano Mirella Freni in 1978, and the two singers frequently performed together. They lived in Modena up until Ghiaurov's death in 2004 of a heart attack.

Ghiaurov first shared a stage with Mirella Freni in 1961 in Genoa. She was Marguerite, he was the devil in "Faust." Married in 1978, they lived in her hometown, Modena. They sang together frequently.

Ghiaurov made his Metropolitan Opera debut on 8 November 1965 as Mephistopheles. He sang a total of eighty-one performances in ten roles there, last appearing there on October 26, 1996, as Sparafucile in Rigoletto. During the course of his career, he also performed at Moscow's Bolshoi Theatre, the Vienna State Opera, Covent Garden, and Paris Opéra.

In the late 1970s Ghiaurov sang the title role in the first complete stereo recording of Jules Massenet's opera Don Quichotte (Don Quixote). He was recorded frequently, and his discography includes complete recording of many of his great stage roles, including Don Giovanni, Don Basilio, Ramfis, Colline, Banco, Gounod and Boito's Mephistos and Boris Godunov among many others.

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1929 - 2004