In the United States, during the Cold War, the missile gap was the perceived superiority of the number and power of the USSR's missiles in comparison with those of the U.S., causing a lack of military parity. The gap in the ballistic missile arsenals did not exist except in exaggerated estimates, made by the Gaither Committee in 1957 and in United States Air Force (USAF) figures. Even the contradictory CIA figures for the USSR's weaponry, which showed a clear advantage for the US, were far above the actual count. Like the bomber gap of only a few years earlier, it was soon demonstrated that the gap was entirely fictional.
John F. Kennedy is credited with inventing the term in 1958 as part of the ongoing election campaign in which a primary plank of his rhetoric was that the Eisenhower administration was weak on defense. It was later learned that Kennedy was informed of the actual situation during the campaign, which has led scholars to question what Kennedy knew and when he knew it. There has been some speculation that he was aware of the illusory nature of the missile gap from the start and that he was using it solely as a political tool, an example of policy by press release.