Estelle Liebling (April 21, 1880 – September 25, 1970) was an American soprano, composer, arranger, music editor, and celebrated voice teacher and vocal coach. Born into the Liebling family of musicians, she began her professional opera career in Dresden as a leading coloratura soprano in 1898 when she was just 18 years old. She sang with several important opera houses in Europe, including the Opéra-Comique, the Semperoper, and the Staatsoper Stuttgart. From 1902 to 1904 she was committed to the Metropolitan Opera, and from 1902 to 1905 she toured internationally in more than 1,600 concerts with John Philip Sousa and his band. After her marriage in 1906, she performed only occasionally in the succeeding two decades.