{{Infobox military conflict|conflict = V-1 and V-2 Intelligence|partof = World War II technology & warfare|image =|caption =|date =|place = European Theatre of World War IIExternal media: map of V-weapon sites|result = ~25% fewer V-1s struck the London Civil Defence Region due to Double Cross|combatant1 = United Kingdom United StatesKey Figures:
* UK: Reginald Victor Jones
* USA: Allen Dulles |combatant2 = Nazi Germany
* V-1: Max Wachtel
* V-2: Walter Dornberger |commander1 =|commander2 =|strength1 = PR Squadrons (5 UK, 5 USA, & 4 CA)agents & informants

{{Infobox military conflict|conflict = V-1 and V-2 Intelligence|partof = World War II technology & warfare|image =|caption =|date =|place = European Theatre of World War IIExternal media: map of V-weapon sites|result = ~25% fewer V-1s struck the London Civil Defence Region due to Double Cross|combatant1 = United Kingdom United StatesKey Figures:
* UK: Reginald Victor Jones
* USA: Allen Dulles |combatant2 = Nazi Germany
* V-1: Max Wachtel
* V-2: Walter Dornberger |commander1 =|commander2 =|strength1 = PR Squadrons (5 UK, 5 USA, & 4 CA)agents & informants Military intelligence on the V-1 and V-2 weapons developed by the Germans for attacks on the United Kingdom during the Second World War was important to countering them. Intelligence came from a number of sources and the Anglo-American intelligence agencies used it to assess the threat of the German V-weapons. The activities included use of the Double Cross System for counter-intelligence and the British (code named) "Big Ben" project to reconstruct and evaluate German missile technology for which Denmark, Poland, Luxembourg, Sweden, and the USSR provided assistance.German counter-intelligence ruses were used to mislead the Allies about V-1 launch sites and the Peenemünde Army Research Center which were targeted for attacks by the Allies.