John Buckman Walthour (August 24, 1904 – October 29, 1952) was the 4th bishop of the Episcopal Diocese of Atlanta in the United States.
He was born 24 August 1904 in Cape May, New Jersey, the son of Harry Clayton and Helen Millward Walthour.
Frederick F. Reese, the Bishop of Georgia ordained Walthour as deacon and priest in 1931.
From 1941 to 1947, he served as chaplain at United States Military Academy, West Point.
In 1947, Walthour was called to be Dean of the Cathedral of St. Philip in Atlanta, Georgia.