| Jurisdiction: | Diocese |
| Mbanza Congo | |
| Latin: | Dioecesis Mbanzacongensis |
| Country: |  Angola |
| Denomination: | Catholicism |
| Parishes: | 8 |
| Rite: | Roman |
| Sui Iuris Church: | Latin Church |
| Cathedral: | Sé Catedral de Nossa Senhora da Conceição |
| Bishop: | Vicente Carlos Kiaziku, OFMCap |
| Archdiocese: | Luanda |
| Emeritus Bishops: | Serafim Shyngo-Ya-Hombo |
| Priests: | 16 |
| Population: | 875,320 |
| Catholics: | 378,468 |
| Catholics Percent: | 43.2 |
| Area Km2: | 39459 |
The Roman Catholic Diocese of Mbanza Congo (Latin: Dioecesis Mbanzacongensis) is a diocese located in the city of M'Banza Congo in the ecclesiastical province of Luanda in Angola.
The Cathedral of the diocese is Sé Catedral de Nossa Senhora da Conceição (Cathedral Church of the Conception of Our Lady) in M'Banza Congo.