It was erected on 14 October 1965, as Diocese of Xuân Lôc / Xuân Lộc (Tiếng Việt) / 春祿 (正體中文) / Xuanlocen(sis) (Latin), on territory split off from its Metropolitan, the Archdiocese of Saigon (now Ho Chi Minh city)
On 22 November 2005, it lost part of its territory to establish the Diocese of Ba Ria.
Statistics
As of 2014, the diocese pastorally served 921,489 Catholics (30.5% of 3,020,800 total) on 5,964 km² in 246 parishes with 498 priests (359 diocesan, 139 religious), 2,256 lay religious (447 brothers, 1,809 sisters) and 168 seminarians.