The Roman Catholic Diocese of Kabgayi (Latin: Kabgayen(sis)) is a diocese located in the city of Kabgayi in the ecclesiastical province of Kigali in Rwanda.

• April 25, 1922: The Apostolic Vicariate of Ruanda was established from the northern part of the Apostolic Vicariate of Kivu.
• February 14, 1952: The Apostolic Vicariate of Ruanda was divided into the Apostolic Vicariate of Kabgayi and the Apostolic Vicariate of Nyundo.
• November 10, 1959: The Apostolic Vicariate of Kabgayi was promoted as Metropolitan Archdiocese of Kabgayi.
• April 10, 1976: Demoted as Diocese of Kabgayi; became a suffragan of Kigali

Vicars Apostolic of Ruanda

• Léon-Paul Classe, M. Afr. (1922.04.10 - 1945.01.31)
• Laurent-François Déprimoz, M. Afr. (1945.01.31 – 1952.02.14)

Vicars Apostolic of Kabgayi

• Laurent-François Déprimoz, M. Afr. (1952.02.14 – 1955.04.15)
• André Perraudin, M. Afr. (1955.12.19 – 1959.11.10)

Metropolitan Archbishop of Kabgayi

• André Perraudin, M. Afr. (1959.11.10 – 1976.04.10)

Bishops of Kabgayi

• André Perraudin, M. Afr. (1976.04.10 – 1989.10.07)
• Thaddée Nsengiyumva (1989.10.07 – 1994.06.0)
  • Fr. André Sibomana (Apostolic Administrator 1994.11.11 – 1996.03.13)
• Anastase Mutabazi (1996.03.13 – 2004.12.10)
• Smaragde Mbonyintege (21 January 2006 – 2 May 2023)
• Balthazar Ntivuguruzwa, bishop elect (2 May 2023 – present)

• Laurent-François Déprimoz, M. Afr. (1943-1945), Coadjutor Vicar Apostolic
• Thaddée Nsengiyumva (1987-1989)

• Jean-Baptiste Gahamanyi, appointed Bishop of Astrida in 1961
• Joseph Sibomana, appointed Bishop of Ruhengeri in 1961

• Roman Catholicism in Rwanda

• GCatholic.org
• Catholic Hierarchy

2°06′03″S 29°45′07″E / 2.1007°S 29.7520°E / -2.1007; 29.7520