The Roman Catholic Diocese of Nkayi () is a diocese located in the city of Nkayi in the ecclesiastical province of Pointe-Noire in the Republic of the Congo.
History 5 December 1983: Established as Diocese of Nkayi from the Diocese of Pointe-Noire
Leadership Bishops of Nkayi (Roman rite), in reverse chronological order François Halyday Mbouangui (1 June 2026 – present), Coadjutor since 1 December 2025 Daniel Mizonzo (16 October 2001 – 1 June 2026) Bernard Nsayi (7 July 1990 – 16 October 2001) Ernest Kombo, S.J. (5 December 1983 – 7 July 1990), appointed Bishop of Owando
See also Roman Catholicism in the Republic of the Congo
Sources GCatholic.org Catholic Hierarchy