The International Paneuropean Union, also referred to as the Pan-European Movement and the Pan-Europa Movement, is an international organisation and the oldest European unification movement. It began with the publishing of Richard von Coudenhove-Kalergi's manifesto Paneuropa (1923), which presented the idea of a unified European State. The Union's General Secretariat is located in Munich, but maintains branches across Europe.

Richard Nikolaus Eijiro, Count of Coudenhove-Kalergi, was a politician, philosopher, and count of Coudenhove-Kalergi. A pioneer of European integration, he served as the founding president of the Paneuropean Union for 49 years. His parents were Heinrich von Coudenhove-Kalergi, an Austro-Hungarian diplomat, and Mitsuko Aoyama, the daughter of an oil merchant, antiques-dealer and major landowner in Tokyo. His childhood name in Japan was Eijiro Aoyama. Being a native Austrian-Hungarian citizen, he became a Czechoslovak citizen in 1919 and then took French citizenship from 1939 until his death.