The first mention of Ostrach occurs in 851. In the 13th century, the area passed gradually from the
Holy Roman Empire into the hands of the monastery of
Salem. On 21 March 1799 the
Austrian and
French troops fought a
battle at Ostrach. In 1803, in the
German Mediatisation, Ostrach and Bachhaupten passed into the hands of the house of
Thurn und Taxis, and in 1806 they were incorporated into the lands of the house of
Hohenzollern-Sigmaringen. The railway line Altshausen-Ostrach-Pfullendorf opened in 1875. The last freight train passed through Ostrach on 31 July 2002. On 1 January 1975 the surrounding villages of Burgweiler (with Dichtenhausen, Hahnennest, Ochsenbach, Waldbeuren, Ulzhausen, Egelreute), Einhart, Habsthal (with Bernweiler), Jettkofen, Kalkreute, Laubbach, Levertsweiler, Magenbuch (with Lausheim), Spöck, Tafertsweiler (with Bachhaupten, Eschendorf, and Gunzenhausen), Wangen, and Wirnsweiler were incorporated into Ostrach. ==Mayors==