The Roman Catholic Diocese of Lu'an/Changzhi is a diocese located in the city of Lu'an in the ecclesiastical province of Taiyuan in China. Currently, in standard Mandarin, the name of the city is pronounced "Luan". In the local dialect, it was pronounced, "Lu-ngan", which was why early accounts by Christian missionaries call it by that name. The American presbyterian publication "The Chinese recorder and missionary journal, Volume 3" calls it "Lu-ngan-fu".