Fanny Louise Ellsworth Davis (October 10, 1904 – 1984), known professionally as Fanny Ellsworth, was an American magazine editor, best known as the editor of pulp magazines including Ranch Romances (for western romances) and Black Mask (for noir detective thrillers).

[3] Later in life, Fanny Ellsworth Davis completed doctoral studies at Columbia University, with a dissertation titled "Two Centuries of the Ottoman Lady" (1968).

[5][6][7] She bought over 30 western stories from Elmer Kelton for Ranch Romances;[8][9] other noted authors she published included Lela Cole Kitson,[10] Walt Coburn and Max Brand.

[12] As "F. Ellsworth",[13] she succeeded Joseph Shaw as editor of Black Mask, a magazine for detective fiction,[14] from 1936 to 1940, promoting noir genre authors including Steve Fisher, Frank Gruber, and Cornell Woolrich.

[23] In 1934,[10] Fanny Ellsworth married fellow magazine editor John Earle "Jack" Davis.