French sculptor; born at Metz in 1855. He began to study at the industrial school at Strasburg, but returned to Metz on the outbreak of the Franco-Prussian war in 1870. Wishing to remain in France, he then went to Nancy, where he continued his studies at the Ecole de Modelage et de Sculpture, supporting himself by carving pipes. Going to Paris in 1876, he was admitted to the Ecole des Beaux-Arts, entering the classes of Dumont, Thomas, and Bonassieux. At the Salon of 1889 Hannaux was awarded a third medal for his "Le Bûcheron"; in the same year he received a second medal for his patriotic group "Le Drapeau," now in the Draguignan Museum; and in 1894 he received the first medal for his "Orphée Mourant," now at the museum of Luxembourg. His "Fleur du Sommeil" was bought by the French government for the museum of Puy. Among Hannaux's best-known busts are those of the Bishop of Metz, Dupont des Loges, Dr. Pinel, Ambroise Thomas, the academicians Henri Weil and Joseph Derenbourg, Mme. Coralie Cahen, and the Baroness de Hirsch.
In 1900 Hannaux was made a chevalier of the Legion of Honor. He was commissioned to execute the bas-reliefs for the Château d'Eau at the exposition of that year. In the Salon of 1903 Hannaùx received the "Médaille d'Honneur."