Diocese of Aba Dioecesis Abana
Location
Country	Nigeria
Territory	Abia State
Ecclesiastical province	Owerri
Metropolitan	Archbishop of Owerri
Coordinates	5°31′34″N 7°29′22″E / 5.52611°N 7.48944°E / 5.52611; 7.48944 Umuahia
Statistics
Area	2,494 km2 (963 sq mi)
Population - Total - Catholics	(as of 2005) 2,253,090 585,021 (26%)
Parishes	59
Information
Denomination	Roman Catholic
Rite	Latin Rite
Established	2 April 1990
Cathedral	Christ the King Cathedral in Aba
Patron	Christ the King
Secular priests	147
Current leadership
Pope	Francis
Bishop	Bishop Augustine Ndubueze Echema
Map
The cathedral is in Aba which is located in Abia State shown here in red.
Website
Profile

The Roman Catholic Diocese of Aba takes its name from the major commercial city of Aba in Abia State. Aba Diocese was created from Umuahia Diocese on April 2, 1990. Its first diocesan bishop, Vincent Valentine Ezeonyia, CSSp, was installed on 2 July 1990 at Christ the King Church; he was ordained bishop on 1 July 1990 at Mater Dei Cathedral in Umuahia. At the time the Catholic Diocese of Aba was created, there were 24 parishes, 33 Indigenous priests, including those born and bred in Aba, many religious people, and a Catholic population of 227,225. The bulk of the Catholic population was concentrated in Aba Urban and its immediate environs. Ezeonyia died in 2015.

In July 1990 Vincent Valentine Ezeonyia, C.S.Sp. took over the administration of the Catholic Diocese of Aba. At some time after he took over the diocese had 144 priests, with 59 parishes, with several men in seminaries, and women in convents.

The bishop has built many primary and secondary schools. The Diocese has a hospital (St Joseph's Catholic Hospital, Ohabiam, Aba) and some Health Centres/Maternities.

During the Millennium Year 2000 the Diocese celebrated its tenth anniversary. The bishop of the diocese, Vincent Valentine Ezeonyia, the clergy and lay faithful held a diocesan "Synod for True Christian Identity", holding sessions in 2001.

1. Arrival of first Roman Catholic missionaries, 1916
2. The first resident priest, 1918
3. Blessing of the first church building, 1929
4. Erected as a pastoral zone, 1958
5. Erected as a diocese, 2 April 1990
6. The first bishop, Most Reverend Doctor V. V. Ezeonyia, C.S.Sp.
7. First synod of the diocese, "True Christian Identity," 29 May - 3 June 2001
8. Mass of Dedication of the Cathedral of Mater Dei, 14 December 2002

^{[citation needed][when?]}

• Patron of the diocese, Christ the King
• Parishes, 59
• Diocesan priests, 147
• Religious priests, 18
• Religious sisters, 111
• Seminarians, 81
• Catechists, 250

• Bishop Vincent Valentine Ezeonyia, CSSp (from 1990; died 2015)
• Bishop Augustine Ndubueze Echema. He was a Monsignor in Owerri Archdiocese and a professor at Catholic Institute of West Africa (CIWA) when, on December 27, 2019, Pope Francis appointed him the new Bishop of Aba Diocese.^{[citation needed]}

• Fortunatus Nwachukwu, appointed nuncio and titular archbishop in 2012.

• Official website of the diocese, www.catholicdioceseofaba.org
• GCatholic.org information