Stephen B. Oates (born 1936) is a former professor of history at the University of Massachusetts Amherst. He is an expert in 19th-century United States history.
Oates has written 16 books during his career, including biographies of Martin Luther King, Jr., Abraham Lincoln, Clara Barton, and John Brown, and an account of Nat Turner's slave rebellion. His Portrait of America, a compilation of essays about United States history, is widely used in advanced high school and undergraduate university American history courses. His two "Voices of the Storm" books are compilations of monologues of key individuals in events leading up to and during the American Civil War. He also appeared in the well-known Ken Burns PBS documentary on the war.
He was accused of plagiarism in his biography of Abraham Lincoln, but may have been later cleared by the University of Massachusetts and the American Historical Association. 
Oates received the Nevins-Freeman Award of the Chicago Civil War Round Table for his historical work on the American Civil War.
Books by Stephen B. Oates
- Woman Of Valor: Clara Barton And The Civil War
- Fires Of Jubilee: Nat Turners Fierce Rebellion
- With Malice Toward None: A Life Of Abraham Lincoln
- Abraham Lincoln: The Man Behind The Myths
- Let The Trumpet Sound: The Life Of Martin Luther King, Jr.
- Approaching Fury: Voices Of The Storm, 1820-1861
- Whirlwind Of War: Voices Of The Storm, 1861-1865
- Confederate Cavalry West Of The River
- Our Fiery Trail: Abraham Lincoln, John Brown, And The Civil War Era
- Biography As History
- America Through the Eyes of an Artisan
- Portrait of America : From Before Columbus to the End of Reconstruction
- To Purge This Land With Blood: Biography of John Brown
- William Faulkner: The Man and the Artist
- "The Ravages of War"