Lucy Christiana, Lady Duff-Gordon (; 13 June 1863 - 20 April 1935) was a leading British fashion designer in the late 19th and early 20th centuries who worked under the professional name Lucile.

The first British-based designer to achieve international acclaim, Lucy Duff-Gordon was a widely acknowledged innovator in couture styles as well as in fashion industry public relations. In addition to originating