John Claggett Danforth (born September 5, 1936) is a retired American politician who began his career in 1968 as the Attorney General of Missouri and served three terms as United States Senator from Missouri. He is a well-regarded political moderate and conciliator who was periodically called out of retirement for troubleshooting and diplomatic roles by both political parties. In 2004 he served briefly as United States Ambassador to the United Nations. Danforth is an ordained Episcopal priest.
Danforth was born in St. Louis, Missouri, the son of Dorothy (Claggett) and Donald Danforth. He is the grandson of William H. Danforth, founder of Purina Mills. His father was the CEO of its successor, Ralston Purina. Danforth's brother, Dr. William Henry Danforth, is former chancellor of Washington University in St. Louis.
Danforth attended St. Louis Country Day School for high school, and he eventually went on to Princeton University where he received his bachelor's degree in 1958. While in college Danforth joined Lambda Chi Alpha. He then attended law and divinity graduate schools at Yale University, and was employed a short time at the New York law firm Davis Polk & Wardwell.