Barbara Wertheim Tuchman (January 30, 1912 – February 6, 1989) was an American self-trained historian and author. She first became known for her best-selling book The Guns of August, a history of the prelude to and first month of World War I, which won the Pulitzer Prize for General Non-Fiction in 1963.
Tuchman focused on writing popular history. Her clear, dramatic storytelling covered topics as diverse as the 14th century and World War I, and sold millions of copies.
Tuchman was the daughter of the banker Maurice Wertheim. She was a first cousin of New York district attorney Robert M. Morgenthau, a niece of Henry Morgenthau, Jr. and granddaughter of Henry Morgenthau Sr., Woodrow Wilson's Ambassador to the Ottoman Empire. She received her Bachelor of Arts from Radcliffe College in 1933.