Deborah Riedel (31 July 1958 – 8 January 2009) was an Australian operatic soprano. Hers is generally regarded as one of the greatest voices ever produced in Australia. She died of cancer at the height of her career, at the age of 50. She won the inaugural Givenchy French Operatic Award in 1994. Her American debut that year was as Amina in La sonnambula in San Diego. She also appeared with the Metropolitan Opera and San Francisco Opera. In 2004, she was Sieglinde in the first modern Australian production of Wagner's Ring Cycle, by the State Opera of South Australia.