The Seventh Circuit Act of 1807 (formally, "An Act establishing Circuit Courts, and abridging the jurisdiction of the district courts in the districts of Kentucky, Tennessee and Ohio", 2 Stat. 420; 9th Congress, ch. 16; enacted February 24, 1807) was a federal statute which increased the size of the Supreme Court of the United States from six Justices to seven, and which also reorganized the circuit courts of the federal judiciary. The Act became law on February 24, 1807, during the Jefferson administration.