Anlong, the Roman Catholic Diocese, is situated in the city of Anlong in the Ecclesiastical province of Guizhou, China.
The Diocese of Anlong was first established as an Apostolic Prefecture on February 16, 1922, by the Holy See, from the Apostolic Vicariates of Kweichow and Guangxi. It was later promoted on April 27, 1927, to an Apostolic Vicariate. It became a Diocese on April 11, 1946.