Theodor Haubach spent his childhood and youth in Darmstadt. In 1914, right after his Abitur, he declared himself a war volunteer, was wounded many times while taking part in the First World War until 1918. After the horror of his wartime experiences, he was now ready to be deployed in more peaceful pursuits.
From 1919 to 1923 Haubach studied philosophy, sociology, and economics and eventually graduated. As of 1920, Haubach, like his friend Carlo Mierendorff, was an SPD member and worked together actively with the Young Socialists. Later (1924-1929), he was editor of the daily newspaper Hamburger Echo, and later still (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 Weimar democracy and actively struggled under the emblem of the "Three Arrows" against the Nazis, who were grasping for power.
Beginning in February 1933, Haubach, like many SPD members, was persecuted by the Nazi régime. After his first arrest in 1934, he was detained in Esterwegen concentration camp. From 1935, he worked as an insurance representative, and later established contacts with the Kreisau Circle. 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 Volksgerichtshof. Now very ill, Theodor Haubach was put to death on 23 January 1945 along with Helmuth James Graf von Moltke at Plötzensee Prison in Berlin.
- Peter Zimmermann: Theodor Haubach (1896-1945) - Eine politische Biographie. Hamburg 2004, 454 pages, ISBN 3-935549-87-3, 30,00 Euro
- Der militante Sozialdemokrat. Carlo Mierendorff 1897 bis 1943. Eine Biografie von Richard Albrecht (JHW Dietz Nachf., 1987, 464 p., ISBN 3-8012-1128-2)
- "Symbolkrieg" in Deutschland; historisch-biografische Skizze von Richard Albrecht (MuK/Universität Siegen, 1986, 52 p.; ISSN 0721-3271)
- Theodor Haubach in the German National Library catalogue
- Haubach's biography on the pages of the Theodor Haubach Secondary School, Berlin-Tempelhof
- Haubach's biography on the pages of the Theodor Haubach School, Hamburg-Altona.
- The Kreisau-Initiative Berlin e.V. which concerns itself with memorializing the Kreisau Circle.
- (all in German)