The Roman Catholic Diocese of Aliwal (Latin: Alivalen(sis)) is a diocese located in the city of Aliwal North (Joe Gqabi District Municipality) in the ecclesiastical province of Eastern Cape in South Africa.

• June 12, 1923: Established as Apostolic Prefecture of Gariep from the Apostolic Vicariate of Cape of Good Hope, Eastern District
• January 27, 1936: Promoted as Apostolic Vicariate of Aliwal
• January 11, 1951: Promoted as Diocese of Aliwal

• The cathedral is named Sacred Heart Cathedral situated on the corner of Cathcart and Young Streets in Aliwal North.

Prefect Apostolic of Gariep

• Fr. Franz Wolfgang Demont, S.C.I. (27 July 1923 – 27 January 1936 see below)

Vicars Apostolic of Aliwal

• Franz Wolfgang Demont, S.C.I. (see above 27 January 1936 – 3 February 1944)
• Johannes Baptist Lück, S.C.I. (13 March 1947 – 11 January 1951 see below)

Bishops of Aliwal

• Johannes Baptist Lück, S.C.I. (see above 11 January 1951 – 17 December 1973)
• Everardus Antonius M. Baaij, S.C.I. (17 December 1973 – 30 October 1981)
• Fritz Lobinger (18 November 1987 – 29 April 2004)
• Michael Wuestenberg (24 February 2008 – 1 September 2017)
• Joseph Kizito (15 November 2019 – present)

• Roman Catholicism in South Africa

• Official website Archived 12 October 2012 at the Wayback Machine
• GCatholic.org
• Catholic Hierarchy

30°41′S 26°42′E / 30.683°S 26.700°E / -30.683; 26.700