The Roman Catholic Diocese of Andong (Hangul/Hanja/Latin: 천주교 안동교구/天主教安東教區/Dioecesis Andongensis) is a diocese of the Latin Rite of the Catholic Church located in Andong, Northern Gyeongsang Province. The diocese is suffragan to the Archdiocese of Daegu. The current bishop of this diocese is John Chrysostom Kwon Hyeok-joo.
Diocese of Andong was formed in May 29th 1969 by Pope Paul VI from the claimed territories of the Archdiocese of Daegu and the Diocese of Wonju. The diocese covers Northern Bound of Northern Gyeongsang Province (Andong, Yeongju, MunGyeong, Sangju, Uljin, YeongYang, Bonghwa, Yeongdeok, Cheongsong, Uiseong and Yecheon).
Its mother church is Mokseong-dong Cathedral of the Immaculate Conception (목성동성당/木城洞聖堂), located at 145-3 Seodongmun Avenue/Seodongmunno, Mokseong-dong 51-1 beonji, Andong City, Northern Gyeongsang Province - not far from Andong City Hall. The titular saint of this cathedral is Saint Mary of the Immaculate Conception. The old building at Mokseong-dong san 1-beonji was established in June 14th 1927 and relocated to the current site in 1949. However, it was deteriorated with the passage of time and came to need more space to play role as a Cathedral.
On April 25th 2004 - the Most Rev. John Chrysostom Kwon Hyeok-joo, Bishop of Andong dedicated the newly remodeled Mokseong-dong Cathedral. The new premises include a chapel, a grand hall, meeting rooms, residence for priests and a house of sisters and the chapel can accommodate about 600 persons. There are also a socializing place for the elderly and free funeral facilities for the local community.