Herta Glaz (also spelled Hertha;[1] September 16, 1910 in Vienna – January 28, 2006 in Hamden, Connecticut[2]) was an Austrian-born American operatic mezzo-soprano, voice teacher, and opera director of Austrian birth.
Some of the roles she portrayed on stage were Marcellina in Le Nozze di Figaro, Annina, Siegrune in Die Walküre, Flosshilde in Götterdämmerung and Magdalene in Die Meistersinger von Nürnberg.
Her notable pupils included sopranos Susan Davenny Wyner and Sally Sanford, and mezzos Gail Dubinbaum, Jacalyn Kreitzer, and Cynthia Munzer.
She served as NHOT's director until the company disestablished due to financial reasons in 1976.
She married several times during her life: first to conductor Joseph Rosenstock and then to Viennese composer Paul August Csonka.