Constantin Fehrenbach, sometimes erroneously Konstantin Fehrenbach,, was a German politician who was one of the major leaders of the Catholic Centre Party. He served as president of the Reichstag in 1918 and then as president of the Weimar National Assembly from 1919 to 1920. In June 1920, Fehrenbach became Chancellor of Germany. During his time in office, the central issue he had to face was German compliance with the terms of the Treaty of Versailles. He resigned in May 1921 when his cabinet was unable to reach a consensus on war reparations payments to the Allies. Fehrenbach remained in the Reichstag and headed the Centre Party's contingent there from 1923 until his death in 1926.

The Centre Party, officially the German Centre Party and also known in English as the Catholic Centre Party, is a Christian democratic political party in Germany. It was most Influential in the German Empire and Weimar Republic. Formed in 1870, it successfully battled the Kulturkampf waged by Chancellor Otto von Bismarck against the Catholic Church. It soon won a quarter of the seats in the Reichstag, and its middle position on most issues allowed it to play a decisive role in the formation of majorities. The party name Zentrum (Centre) originally came from the fact that Catholic representatives would take up the middle section of seats in parliament between the social democrats and the conservatives.