Major John Beach was a United States Army officer during the Black Hawk and American Civil War. He was the last U.S. 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 Street's death, and he eventually hosted the week-long council that resulted in the signing of the 1842 treaty for the purchase of much of Iowa from the Sac and Fox Indians.