Maria von Ilosvay (8 May 1917 – 16 June 1987) was a Hungarian contralto renowned for her performances of the role of Erda in Richard Wagner's Der Ring des Nibelungen. She studied in Budapest and Vienna, and in 1937 won first prize in the International Singing Contest in Vienna. In 1940, she joined the Hamburg company. She appeared as guest artist in Vienna, Brussels, Amsterdam, and Salzburg. She became a mainstay at the Bayreuth Festival following its re-opening in 1951 when she made her debut there. She recorded the role of Erda in live recordings from Bayreuth conducted by Clemens Krauss and Joseph Keilberth.