Bodyguard of Lies is a 1975 non-fiction book on Allied military deception operations during World War II written by Anthony Cave Brown.

His first major historical work, it derives its name from a wartime quote of Winston Churchill, and offers a narrative account of aspects of both the Allied and German intelligence operations during the war.

Brown discusses early deceptions, such as those surrounding Operation Torch, conducted against the Germans, and how the Abwehr struggled to decipher the information it was being fed.

In particular, Brown discusses Operation Fortitude and the fictional First US Army Group (FUSAG), a key part of Bodyguard, calling it "the greatest charade in history".

[5] The final section of the book covers events on and after D-Day, including physical deceptions carried out on the night of the invasion, and the continued impact of Bodyguard in the months after the landings.

[3] In a letter to the editor in reply, Deputy Chief Historian for the United States Army, Charles B. MacDonald, referred to the book as "the most important work on World War II in a quarter of a century.

"[4] Writing in Military Review, Alexander Cochran noted that the book was one of the first non-memoir accounts of intelligence operations during the war and was unusual (for its genre) in documenting sources.

"[7] Russell J. Bowen concludes that although the writing and coverage were better than similar books then available, "Cave Brown's work fails to escape the common stigma of intelligence narratives: considerable inaccuracy as to detail and occasional lack of validity of interpretation.