Blanche Marchesi (4 April 1863 – 15 December 1940) was a French mezzo-soprano and voice teacher best known for her interpretations of the works of Richard Wagner. She was the daughter of Mathilde Graumann Marchesi, a German voice instructor who taught a variety of well-known opera singers, including Emma Eames, Nellie Melba, and Emma Calve.
Marchesi was born in Paris in February 1863. For her education, she attended boarding schools in Frankfurt, Germany and then Paris. Although she initially was educated as a violinist, she decided to pursue a singing career in 1881. Her first concert was held at Queen's Hall in 1896. Opera critics at the time criticized her technical skill but praised her interpretive ability. During her career as a voice teacher, Marchesi instructed such singers as British contraltos Muriel Brunskill and Astra Desmond. She premiered a work of Cecile Chaminade in England in the 1890s. She held a farewell concert in 1938, two years before her death.
Marchesi had two sisters, Therése and Stella. Her parents where Mathilde Graumann Marchesi of Frankfurt and Salvatore De Castrone (Marchese di Palermo, hence the stage name Marchesi), who was also an opera singer and a voice instructor. He was also involved as a key figure in the Italian Revolution of 1848 where he initiated the uprising at the Palazzo Raimondi in Milan. She was first married to Baron Alexander Popper von Podhragy, Vienna, with whom she had 3 sons. Leopold, Fritz and Ernst. Leopold was declared enemy of the state by the Nazis and the Democratic Republic of Austria and expropriated. Fritz was killed by Austrian Nazis in 1948 in Austria. Ernst was deported to Dachau, freed and fled to the United States of America. Baron André Anzon Caccamisi,London, was her second husband as of 1894 with whom she had one son, Baron Jerome Anzon-Caccamisi, who was murdered by the National Socialists in February 1945 as a Resistance and French intelligence officer in the Mauthausen-Gusen concentration camp in Austria.