Marshall, Peter (1902-1949), was a Presbyterian minister who served as chaplain of the United States Senate from January 1947 until his death. His prayers as chaplain of the Senate were in striking language, and parts of them were widely quoted. His wife, Catherine Marshall, wrote a biography of him, A Man Called Peter (1951). It was later made into a motion picture.
Marshall was born in Coatbridge, Scotland. His father died when he was 4, and he struggled against poverty through childhood. He came to the United States in 1927, and graduated from the Columbia Seminary in Decatur, Georgia, in 1931. He served three pastorates, the last being the New York Avenue Presbyterian Church in Washington, D.C. He preached there the last 12 years of his life.