Theodor Haubach (15 September 1896 in Frankfurt am Main – 23 January 1945 in Berlin) was a German journalist, SPD politician, and resistance fighter against the Nazi régime.
From 1924 to 1929 he was editor of the newspaper Hamburger Echo, and later (1929-1933) an associate at the Reich Interior Ministry and with the Berlin Police President.
From 1924 Haubach was the leading member of the Reichsbanner Schwarz-Rot-Gold, an association that campaigned fiercely for the Weimar democracy and actively struggled under the emblem of the "Three Arrows" against the Nazis, who were grasping for power.
After the failed attempt on Hitler's life at the Wolf's Lair in East Prussia on 20 July 1944, Haubach was arrested and sentenced to death by the Nazi "People's Court" (Volksgerichtshof).
Now very ill, Theodor Haubach was hanged on 23 January 1945 along with Helmuth James Graf von Moltke at Plötzensee Prison in Berlin.