Inside Hitler's Bunker: The Last Days of the Third Reich (German: Der Untergang: Hitler und das Ende des Dritten Reiches) is a book by historian Joachim Fest about the last days of the life of Adolf Hitler, in his Berlin Führerbunker in 1945.

The book was originally published in Germany in 2002.

The book formed source material for the 2004 German film Der Untergang (The Downfall) in 2004.

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