Friedrich Wilhelm Ernst Hardt (May 9, 1876 – January 3, 1947), born Ernst Stöckhardt,, was a German playwright, poet, and novelist.
Hardt was born in Graudenz, West Prussia (now Grudziądz, Poland).
He is the author of Priester des Todes (1898), Bunt ist das Leben (1902), An den Toren des Lebens (1904), and the plays Der Kampf ums Rosenrote (1903), Nipon von Lenclos (1905), Tantris der Narr (1907), Gudrun (1911), and Konig Salomo (1915). He was director of the National Theater in Weimar (1919-24), State Theater in Cologne (1925), and the West German Broadcasting Co. (1926-1933).
Hardt died in Ichenhausen.