The constitution of the German Confederation was the constitution of the German nation state at the beginning of 1871. It was a revised version of the constitution of the North German Confederation.

The constitution of the German Confederation included provisions that the North German Confederation would admit southern German states: Baden and Hesse-Darmstadt, but not yet Bavaria and Württemberg. The constitution was publicated on December 31, 1870 in the Federal Law Gazette of the North German Confederation and came into force on January 1, 1871. On April 16, it was replaced by a newly edited imperial constitution which was in force until the end of the empire in 1918.

The constitution represents a step in the transition from the North German Confederation to the German Empire. No new state was founded but the admission of southern German states into the North German Confederation was regulated. Article 80 regulated that northern German federal laws largely applied to the new member states in the south.