The diocese was established on 4 September 1940 as the
Diocese of Silva Porto on territory separated from the
Diocese of São Paulo de Loanda. Initially, the diocese was a
suffragan of the
Roman Catholic Archdiocese of Luanda. The diocese lost territory on 25 November 1957 to establish the
Roman Catholic Diocese of Malanje and on 1 July 1963 to establish the
Diocese of Luso. On 3 February 1977, the diocese changed suffragans to the
Archdiocese of Huambo. On 16 May 1979, it was renamed as the Diocese of Kwito-Bié. ==Special churches==