Foreign Affairs is an American magazine of international relations and U.S. foreign policy published by the Council on Foreign Relations, a nonprofit, nonpartisan, membership organization and think tank specializing in U.S. foreign policy and international affairs. Founded in 1922, the print magazine is currently published every two months, while the website publishes articles daily and anthologies every other month.

Foreign Affairs is considered one of the United States' most influential foreign policy magazines. Over its long history, the magazine has published a number of seminal articles including George Kennan's "X Article", published in 1947, and Samuel P. Huntington's "The Clash of Civilizations," published in 1993.

Important academics, public officials, and policy leaders regularly appear in the magazine's pages. Recent Foreign Affairs authors include Robert O. Keohane, Hillary Clinton, Donald H. Rumsfeld, Ashton Carter, Colin L. Powell, Francis Fukuyama, David Petraeus, Zbigniew Brzezinski, John J. Mearsheimer, Stanley McChrystal, Christopher R. Hill and Joseph Nye.

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The Council on Foreign Relations, founded in the summer of 1921, primarily counted diplomats, financiers, scholars, and lawyers among its members. Its founding charter declared its purpose should be to "afford a continuous conference on international questions affecting the United States, by bringing together experts on statecraft, finance, industry, education, and science." In its first year, the Council engaged primarily in discourse via meetings and small discussion groups, however, eventually it decided to seek a wider audience and it began publishing Foreign Affairs in September 1922 on a quarterly basis.

The Council named Professor Archibald Cary Coolidge of Harvard University as the journal's first editor. As Coolidge was unwilling to move from Boston to New York, Hamilton Fish Armstrong, a Princeton alumnus and a European correspondent of the New York Evening Post, was appointed managing editor and worked New York, handling the day-to-day mechanics of publishing the journal. Armstrong chose the distinctive light blue color for the cover of the magazine, while his sisters, Margaret and Helen, designed the logo and lettering respectively.

Foreign Affairs is a successor publication of the Journal of International Relations (which ran from 1910 to 1922), which in turn was a successor to the Journal of Race Development (which ran from 1911 to 1919).