The Executive Committee of the National Security Council was a body of United States government officials that convened to advise President John F. Kennedy during the Cuban Missile Crisis in 1962. It was composed of the regular members of the National Security Council, along with other men whose advice the President deemed useful during the crisis. EXCOMM was formally established by National Security Action Memorandum 196 on October 22, 1962. It was made up of twelve full members in addition to the president. Advisers frequently sat in on the meetings, which were held in the Cabinet Room of the White House's West Wing and secretly recorded by tape machines activated by Kennedy. None of the other committee members knew the meetings were being recorded, save probably the president's brother, Attorney General Robert F. Kennedy.

The Cuban Missile Crisis, also known as the October Crisis in Cuba, or the Caribbean Crisis, was a 13-day confrontation between the governments of the United States and the Soviet Union, when American deployments of nuclear missiles in Italy and Turkey were matched by Soviet deployments of nuclear missiles in Cuba. The crisis lasted from 16 to 28 October 1962. The confrontation is widely considered the closest the Cold War came to escalating into full-scale nuclear war.