The fonds consists of the episcopal and personal records of Archbishop Roche, documenting all aspects of the involvement of the Roman Catholic Church in the political, economic, educational and cultural life of Newfoundland and Labrador. The fonds has been arranged in 36 series, each with a detailed description, including biographical/administrative sketches when appropriate.

Fonds consists of records related to Archdeacon Kyran Walsh including canonical documents of ordination and appointment. Fonds also includes newspaper clippings and printed material related to his life.

Fonds consists of records related to Archdeacon Thomas O'Connor, including baptismal certificate and canonical documents. Fonds also includes newspaper clippings and printed material related to his life.

Fonds consists of sacramental ledgers, including baptismal registers (1843-1948), illegitimates baptismal register (1901-47), marriage registers (1844-98) and death registers (1891-97, 1927-75). The fonds also includes financial statements (1915-30); documents related to parish property and buildings (1955-78); correspondence (1951-79); parish documents (1891, 1915-19); and parish boundaries (1985). There are also addresses prepared for the Bishop's visits (1951, 1961); one photograph and related records.

Fonds also includes printed material which relates to the Parish's history and activities

Fonds consists of baptismal (1802-1855), marriage (1793-1882), and publication (1873-1907) registers; a marriage register index (1821-1855); microfilm reels of marriage registers (1793-1899) and baptismal registers (1802-1889); a register that documents the conveyance of stone for the construction of the Cathedral (1837-1857); canonical decrees and maps delineating parish boundaries (1982-1998); correspondence relating to the general operation of the parish and the maintenance of the Basilica-Cathedral (1853, 1952-1955, 1972-1979); photographs of the Basilica-Cathedral and its ornamentation (1980); and articles of incorporation for the Roman Catholic Episcopal Corporation of St. John's (1913).

Material also has been collected around the theme of the parish and integrated into the fonds by the Archives. This material includes newspaper clippings, articles, and histories detailing the construction, ornamentation, and architecture of the Basilica-Cathedral, and church bulletins and publications. Photocopies predominate.

Fonds consists of records related to Bishop George Conroy and includes baptismal certificate and canonical certificates of appointment. Fonds also includes newspaper clippings and printed material related to his life.

Fonds consists of canonical certificates of ordination, correspondence and a copy of his last will and testament. Fonds also includes newspaper clippings and printed material related to his life.

Fonds consists of letters of appointment, diary notes, testimonial letters, land lease for the Old Chapel (St. John's), correspondence and a copy of his last will and testament. Fonds also includes newspaper clippings and printed material related to his life.

Fonds consists of letters, Coat of Arms, correspondence with Brother Luke Slattery. Fonds also includes printed material related to his life.

Fonds consists of baptismal certificate, graduation certificates, letters of appointment, pastorals (1870-1893); diaries (1870-1886); family scrapbook, photograph albums, testimonials from Holy Cross College professors; correspondence, including letters about Orange Society disturbances (1878) and his relationship with the Benevolent Irish Society (BIS); and a copy of his last will and testament. Fonds also includes newspaper clippings and printed material related to his life.