Caleb Carr (born August 2, 1955) is an American military historian and author. Carr is the second of three sons born to Lucien Carr and Francesca Von Hartz.

He authored The Alienist, The Angel of Darkness, The Lessons of Terror, Killing Time, The Devil Soldier, The Italian Secretary, and The Legend of Broken. He has taught military history at Bard College, and worked extensively in film, television, and the theater. His military and political writings have appeared in numerous magazines and periodicals, among them The Washington Post, The New York Times, and The Wall Street Journal. He lives in upstate New York.

Carr stated as a child that he "wanted nothing less than to be a fiction writer".