The Most Awful Responsibility: Truman and the Secret Struggle for Control of the Atomic Age is a 2025 nonfiction book by Alex Wellerstein about U.S. President Truman's nuclear policy.
Kirkus Reviews called it "A nuanced portrait of a president who shaped the modern nuclear age." A review in The Wall Street Journal said it was "a well-written opus" drawing on recently unclassified documents and private diaries of Truman's contemporaries. Library Journal said it was a "must-read book".