Allen Welsh Dulles (; April 7, 1893 - January 29, 1969) was an American diplomat and lawyer who became the first civilian Director of Central Intelligence (DCI), and its longest-serving director to date. As head of the Central Intelligence Agency (CIA) during the early Cold War, he oversaw the 1954 Guatemalan coup d'etat, Operation Ajax (the overthrow of Iran's elected government), the Lockheed U-2 aircraft program and the Bay of Pigs Invasion. Following the assassination of John F. Kennedy, Dulles was one of the members of the Warren Commission. Between his stints of government service, Dulles was a corporate lawyer and partner at Sullivan & Cromwell.

After the outbreak of the Second World War, Dulles was recruited to work at the Office of Strategic Services and moved to Bern, Switzerland, where he lived at Herrengasse 23 for the duration of World War II. As Swiss Director of the OSS, Dulles worked on intelligence regarding German plans and activities, and established wide contacts with German emigres, resistance figures, and anti-Nazi intelligence officers. He was assisted in intelligence-gathering activities by Gero von Schulze-Gaevernitz, a German emigrant. Dulles also received valuable information from Fritz Kolbe, a German diplomat, one whom he described as the best spy of the war. Kolbe supplied secret documents regarding active German spies and plans regarding the Messerschmitt Me 262 jet fighter. Although Washington barred Dulles from making firm commitments to the plotters of the 20 July 1944 attempt to assassinate Hitler, the conspirators nonetheless gave him reports on developments in Germany, including sketchy but accurate warnings of plans for Hitler's V-1 and V-2 missiles. Dulles was involved in Operation Sunrise, secret negotiations in March 1945 to arrange a local surrender of German forces in northern Italy. After the war in Europe, Dulles served for six months as the OSS Berlin station chief and later as station chief in Bern. The Office of Strategic Services was dissolved in October 1945 and its functions transferred to the State and War Departments. In the 1948 Presidential election, Dulles was, together with his brother, an advisor to Republican nominee Thomas E. Dewey. The Dulles brothers and James Forrestal helped form the Office of Policy Coordination. During 1949 he co-authored the Dulles-Jackson-Correa Report, which was sharply critical of the Central Intelligence Agency, which had been established by the National Security Act of 1947. Partly as a result of the report, Truman named a new Director of Central Intelligence, Lieutenant General Walter Bedell Smith.

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jet fighter.