Mitsuko, Countess of Coudenhove-Kalergi (German: Mitsuko, Gräfin von Coudenhove-Kalergi; 7 July 1874 – 27 August 1941), formerly known as Mitsu Aoyama (青山みつ), was one of the first Japanese people to emigrate to Europe, after becoming the wife of an Austrian diplomat, Heinrich von Coudenhove-Kalergi, in Tokyo. She was the mother of Richard Nikolaus von Coudenhove-Kalergi.