The Roman Catholic Diocese of Datong/Tatung (Latin: Tatomen(sis), Chinese: 大同) is a Latin diocese in the ecclesiastical province of Taiyuan in PR China.

It has its cathedral episcopal see Cathedral of the Immaculate Heart of Mary in the city of Datong (Shanxi) but is vacant.

(all Roman Rite; so far all missionary members of the Latin congregation Scheutists, C.I.C.M.)

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