Inez Barbour Hadley (September 23, 1879 – January 8, 1971) was an American soprano.

[4][5] A 1913 reviewer described her as "a splendid looking woman of appealing charm, of warm temperament, of perfect poise and above all of glorious voice.

[10][11][12] He founded the National Association of American Composers and Conductors in 1933; after her husband's death in 1937, she took over the organization, and was its leader for over thirty years.

[14] In 1944, she launched the SS Henry Hadley, a supply ship used in World War II.

In 1918, Inez Barbour married conductor and composer Henry Kimball Hadley.