Soviero studied at the Juilliard School of Music with Florence Berggren, Marinka Gurewich, Martin Rich, and Boris Goldovsky. She made her debut under the name Diana Catani-Soviero at the Chautauqua Opera in 1969 as Mimi in La Boheme. In the early years of her career she performed widely in smaller American theatres building herself a repertory.
She was a celebrity guest on a week of Match Game in 1980.
She made her debut at the New York City Opera in 1973, the Lyric Opera of Chicago in 1979, the San Francisco Opera in 1982, establishing herself in verismo roles, notably as Nedda, Manon Lescaut, Madama Butterfly.
Beginning in 1981, she appeared at the New York City Opera in Verdi's La Traviata, conducted by Mario Bernardi. and widely in Europe; Zürich, Toulouse, Nice, Hamburg, Munich, Rome, Palermo, etc. In 1987, she made her debuts at both La Scala in Milan, and the Metropolitan Opera in New York. She made her debut at the Paris Opéra in 1988, and Royal Opera House in London in 1989.
Soviero is married to Bernard Uzan, renowned operatic stage director, who was the director of the Florida Grand Opera Young Artist Program from 1996-2001, and former artistic director of l'Opéra de Montréal, where she often appeared in the 1990s. She makes her home between New York City, Miami Beach, and France. She is a faculty member at Mannes School of Music.
- Henahan, Donal (18 October 1981). "CITY OPERA: 'TRAVIATA' WITH DIANA SOVIERO". New York Times. Retrieved 4 November 2010.
- BWW News Desk (4 November 2018). "Diana Soviero And Bernard Uzan Become Artistic Directors Of Florida Grand Opera Young Artist Program". Retrieved 30 July 2018.
- Soviero Biography on Operissimo.com (in German)