The Locarno Treaties, known collectively as the Locarno Pact, were seven post-World War I agreements negotiated amongst Germany, France, Great Britain, Belgium, Italy, Poland and Czechoslovakia in late 1925. In the main treaty, the five western European nations pledged to guarantee the inviolability of the borders between Germany and France and Germany and Belgium as defined in the Treaty of Versailles. They also promised to observe the demilitarized zone of the German Rhineland and to resolve differences peacefully under the auspices of the League of Nations. In the additional arbitration treaties with Poland and Czechoslovakia, Germany agreed to the peaceful settlement of disputes, but there was notably no guarantee of its eastern border, leaving the path open for Germany to attempt to revise the Versailles Treaty and regain territory it had lost in the east under its terms.
The Locarno Treaties significantly improved the political climate of western Europe from 1925 to 1930 and fostered expectations for continued peaceful settlements which were often referred to as the "spirit of Locarno". The most notable result of the treaties was Germany's acceptance into the League of Nations in 1926.
