John F. Kennedy assassination conspiracy theories

There have been numerous conspiracy theories surrounding the assassination of John F. Kennedy on November 22, 1963. These theories posit that the assassination involved many people or organizations. Most of today's theories put forth a criminal conspiracy involving parties as varied as the CIA, the Mafia, sitting Vice President Lyndon B. Johnson, Cuban President Fidel Castro, the KGB, or some combination of those entities. Some conspiracy theories claim that the United States government covered up crucial information in the aftermath of the assassination.

In 1964, the Warren Commission concluded that Lee Harvey Oswald was the only person responsible for assassinating Kennedy. In 1979, the United States House Select Committee on Assassinations (HSCA) concluded that a second gunman other than Oswald probably fired an extra bullet at Kennedy. The HSCA did not identify that second shot, nor did they identify any other person or organization as having been involved. The acoustic evidence on which the HSCA based its second gunman conclusion has since been discredited.

Public opinion polls have consistently shown that a majority of Americans believe there was a conspiracy to kill President Kennedy. Polls from the Gallup Organization have also found that only 20–30% of the population believe that Oswald did act alone. These polls also show that there has been no agreement on who else may have been involved. Former Los Angeles District Attorney Vincent Bugliosi estimated that a total of 42 groups, 82 assassins, and 214 people had been accused in various conspiracy theories on the assassination.

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