Mildred Miller Posvar (December 16, 1924 – November 29, 2023) was an American classical mezzo-soprano who had a major career performing in operas, concerts, and recitals during the mid twentieth century. She was notably a principal artist at the Metropolitan Opera from 1951 through 1974. In 1978 she founded the Opera Theater of Pittsburgh, serving as the company's Artistic Director through 1999.
