John Claggett "Jack" Danforth (born September 5, 1936) is a former United States Ambassador to the United Nations and former Republican United States Senator from Missouri. He is an ordained Episcopal priest. Danforth is married to Sally D. Danforth and has five adult children.
Danforth was born in 1936 in St. Louis, Missouri. He attended St. Louis Country Day School, received his bachelor's degree from Princeton University in 1958, and attended both law and divinity graduate schools at Yale University. Danforth is the grandson of William H. Danforth founder of Ralston Purina. His father was Donald Danforth, a former chief executive of the company. One of his brothers is Dr. Bill Danforth, former chancellor of Washington University in St. Louis.
He is a brother in the Lambda Chi Alpha Fraternity.