Major-general Dirk Reinhard Adelbert van Langen (Magelang, May 17, 1898 – Doorn, January 20, 1983) was member of the Chief of Staff to of the Royal Netherlands East Indies Army the Territorial Commander of East-Java and commander of the T brigade during the Indonesian war of Independence of the Royal Netherlands East Indies Army and in the Dutch East Indies, from 1946 to 1949, during the Indonesian National Revolution.