Sandra Warfield was an American operatic mezzo-soprano who performed with New York City's Metropolitan Opera from the 1950s through the 1970s.
She was born in Kansas City, Missouri on June 8, 1921, as Flora Jean Bornstein and studied music there at the Kansas City Conservatory of Music. She made her stage debut with the Los Angeles Civic Light Opera during the 1940s. In 1950 she portrayed Prince Orlofsky in Die Fledermaus at the Chautauqua Opera.
Warfield first appeared on the stage of Metropolitan Opera in a 1953 performance of The Marriage of Figaro, the 1786 opera by Wolfgang Amadeus Mozart, in which she sang the role of a peasant girl. She sang the role of Delilah in Camille Saint-Saëns's Samson and Delilah at a concert in Norfolk, Virginia in 1953 for which she was separately booked with tenor James McCracken, also a fellow performer at the Met, and the two were married shortly thereafter. McCracken left the Met in 1957, complaining that he was not being given lead roles. They moved to Europe, where they spent several years. There she performed with the Zurich Opera, where in 1961 she sang Katerina in the world premiere of Martinů's The Greek Passion.