Sebastian Haffner (the pseudonym for Raimund Pretzel) was a German journalist and author whose focus was the history of the German Reich (1871-1945). His books dealt with the origins and course of the First World War, the failure of the Weimar Republic and the subsequent rise and fall of Nazi Germany under Hitler.

In 1938 he emigrated from Nazi Germany with his Jewish fiancée to London, hardly able to speak English but becoming rapidly proficient in the language. He adopted the pseudonym Sebastian Haffner so that his family back in Germany would not be endangered by his writing.

Haffner wrote for the London Sunday newspaper, The Observer, and then became its editor-in-chief. In 1954, he became its German correspondent in Berlin, a position which he kept until the building of the Berlin Wall.

He wrote for the German newspaper, Die Welt, until 1962, and then until 1975 was a columnist for the Stern magazine. Haffner was a frequent guest on the television show Internationaler Frühschoppen and had his own television program on the German channel, Sender Freies Berlin.