Operation Bodyguard was the code name for a World War II deception strategy employed by the Allied states before the 1944 invasion of northwest Europe. Bodyguard set out an overall stratagem for misleading the Oberkommando der Wehrmacht as to the time and place of the invasion. Planning for Bodyguard was started in 1943 by the London Controlling Section, a department of the war cabinet. They produced a draft strategy, referred to as Plan Jael, which was presented to leaders at the Tehran Conference in late November and, despite scepticism due to the failure of earlier deception strategy, approved on 6 December 1943.

Bodyguard was a strategy under which all deception planners would operate. The overall aim was to lead the Germans to believe that an invasion of northwest Europe would come later than was planned and to expect attacks elsewhere, including the Pas-de-Calais, the Balkans, southern France, Norway and Soviet attacks in Bulgaria and northern Norway. The key part of the strategy was to attempt to hide the amount of troop buildup in Southern England, by developing threats across the European theatre, and to emphasise an Allied focus on major bombing campaigns.

The main stratagem was not an operational approach; instead it set out the overall themes for each subordinate operation to support. Deception planners in England and Cairo developed a number of operational implementations (of which the most significant was Operation Fortitude which developed a threat to Pas-de-Calais).

In June 1944 the Allied forces successfully landed and established a beachhead in Normandy. Later evidence demonstrated that German intelligence had believed significant parts of the deceptions, particularly the order of battle of the armies in Southern England. Following the invasion, Hitler delayed redeploying forces from Calais and other regions to defend Normandy for nearly seven weeks (the original plan had specified 14 days). Evidence suggests that the threat against Pas-de-Calais, and to a lesser extent Norway and Southern Europe, contributed to this decision.