Louis Gustave Fortuné Ratisbonne (29 July 1827 – 24 September 1900) was a French man of letters.

He was connected with the Journal des Debats from 1853 to 1876; became librarian of the palace of Fontainebleau in 1871, and three years later to the Senate.

He is also the author of some charming fables and verses for children: La Comédie enfantine (1860), Les Figures jeunes (1865) and others.

He was literary executor of Alfred de Vigny, whose Destinées (1864) and Journal d'un poète (1867) he published.

Through the influence of Thiers, Ratisbonne was appointed librarian at Fontainbleau, where he succeeded Octave Feuillet, and later he was transferred to the Palais du Luxembourg.