David Elton Trueblood (December 12, 1900 – December 20, 1994), usually known as "Elton Trueblood" or "D. Elton Trueblood", was a noted 20th century American Quaker author and theologian, former chaplain both to Harvard and Stanford universities. He has been called "the Dean of American Religious Writing." He wrote 33 books over his lifetime. "Trueblood sought to do for American audiences what C.S. Lewis had achieved in Britain a quarter of a century earlier." He was a friend to several U.S. Presidents and served as an advisor to Eisenhower and Nixon.