Philip Caryl Jessup (February 5, 1897 – January 31, 1986) was a 20th-century American diplomat, scholar, and jurist notable for his accomplishments in the field of international law.

In 1929, he assisted Elihu Root for the Conference of Jurists on the Permanent Court of International Justice in Geneva, Switzerland.

[1] In 1943, Jessup served as assistant secretary-general of the United Nations Relief and Rehabilitation Administration (UNRRA) conference through 1944.

In 1945, he was a technical advisor to the American delegation to the San Francisco United Nations charter conference in 1945 (whose Acting Secretary was Alger Hiss).

"[1][2] As Ambassador, Jessup served on the 1949 U.S. delegation of the Sixth Session of the Paris Council of Foreign Ministers Meeting.

[1][5] From 1967 to 1986, he served as chairman of the Chile-Norway Permanent Commission and as an honorary member of the Governing Council for the International Institute for Unification of Private Law.

Jessup was subsequently cleared of all charges by the Loyalty Board of the State Department and the Tydings Committee, and McCarthy was rebuked by many fellow senators and other statesmen.

Shortly after John F. Kennedy took office as president, the State Department approved the appointment of Jessup as U.S. candidate for the International Court of Justice, a post that did not need Senate confirmation.