Major John Beach (January 1, 1812 – August 31, 1874) was a United States Army officer during the Black Hawk and American Civil War as well as the last US Indian Agent to the Sac and Fox tribes. A son-in-law to General Joseph Street, Beach succeeded him as agent to the Sac and Fox upon his death and eventually hosted the week long council that resulted in the signing of the treaty for the purchase of much of Iowa from the Sac and Fox Indians in October 1842.