Mark Allan Noll (born 1946) is an American historian specializing in the history of Christianity in the United States.

Before coming to Notre Dame, he was on the faculty at Wheaton College, Illinois for twenty-seven years, where he taught in the departments of history and theology as McManis Professor of Christian Thought.

While at Wheaton, Noll also co-founded (with Nathan Hatch) and directed the Institute for the Study of American Evangelicals (ISAE), which ran from 1982 until 2014.

[7] Noll, along with other historians such as George Marsden, Nathan O. Hatch, and David Bebbington, has greatly contributed to the world's understanding of evangelical convictions and attitudes, past and present.

He has caused many scholars and lay people to realize more deeply the complications inherent in the question, "Is America a Christian nation?