Delores Ziegler (born 4 September 1951) is an American mezzo-soprano who has had an active international performance career since the late 1970s. A former resident artist at the Cologne Opera, she has performed leading roles with many of the world's best opera houses, including La Scala, the Lyric Opera of Chicago, the Metropolitan Opera, the San Francisco Opera, and the Vienna State Opera. She is currently a professor of voice at the University of Maryland. While she has performed a broad repertoire, she is widely admired for her performances in operas by Wolfgang Amadeus Mozart and Richard Strauss; particularly Cherubino in The Marriage of Figaro, Dorabella in Così fan tutte, Idamante in Idomeneo, and Octavian in Der Rosenkavalier.