The Roman Catholic Diocese of Hamilton may refer to:
The Roman Catholic Diocese of Hamilton is a suffragan Latin bishopric in the ecclesiastical province of the Metropolitan Roman Catholic Archdiocese of Toronto, in Ontario, Canada.
The Roman Catholic Diocese of Hamilton in Bermuda is a diocese of the Latin Church of the Catholic Church in North America. The diocese comprises the entirety of the dependency of Bermuda. The diocese is a suffragan of the Archdiocese of Nassau, and a member of the Antilles Episcopal Conference.
The Latin Church Catholic Diocese of Hamilton, New Zealand is a suffragan diocese of the Roman Catholic Archdiocese of Wellington. It is centred in Hamilton, New Zealand and was formed on 6 March 1980 from a portion of the territory in the Diocese of Auckland. The Cathedral of the Diocese is the Cathedral of the Blessed Virgin Mary.
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The Archbishop of Westminster heads the Roman Catholic Diocese of Westminster, in England. The incumbent is the Metropolitan of the Province of Westminster, Chief Metropolitan of England and Wales and, as a matter of custom, is elected President of the Catholic Bishops' Conference of England and Wales, and therefore de facto spokesman of the Catholic Church in England and Wales. All previous Archbishops of Westminster have become Cardinals. Although all the bishops of the restored diocesan episcopacy took new titles, like that of Westminster, they saw themselves in continuity with the pre-Reformation Church and post-Reformation Vicars Apostolic and Titular Bishops. Westminster, in particular, saw itself as the continuity of Canterbury, hence the similarity of the coat of arms of the two Sees, with Westminster believing it has more right to it since it features the pallium, a distinctly Catholic symbol of communion with the Holy See.
John Michael Sherlock was the Roman Catholic Bishop of London, Ontario, from July 8, 1978 to April 27, 2002. He was born in Regina, Saskatchewan and raised in Brantford, Ontario. Second eldest of a family of eight, four of his five brothers also studied at the seminary. Two of them, Fr William Sherlock and Fr Philip Sherlock, were ordained priests.
The Roman Catholic Archdiocese of Samoa–Apia consists of the Independent State of Samoa.

The Roman Catholic Diocese of Motherwell is an ecclesiastical diocese of the Catholic Church in Scotland.
The Roman Catholic Diocese of Ogdensburg is a Roman Catholic diocese in New York. It was founded on February 15, 1872. It comprises the entirety of Clinton, Essex, Franklin, Jefferson, Lewis and St. Lawrence counties and the northern portions of Hamilton and Herkimer counties.
St. Peter's Cathedral, or variations of the name, may refer to:
The Roman Catholic Diocese of Peterborough is a suffragan Latin diocese in the ecclesiastical province of the Metropolitan Archdiocese of Kingston, Ontario that includes part of the federal Province of Ontario in inland Canada.
The Roman Catholic Diocese of Maitland-Newcastle is a suffragan Latin Rite diocese of the Archdiocese of Sydney, established in 1847, initially as the Diocese of Maitland and changed to the current name in 1995. The diocese covers the Hunter and Mid North Coast regions of New South Wales in Australia.
The Roman Catholic Diocese of Auckland is a Latin Rite diocese of the Catholic Church in Auckland, New Zealand. It was one of two dioceses in the country that were established on 20 June, 1848. Auckland became a suffragan diocese of the Roman Catholic Archdiocese of Wellington in 1887. A large area of the diocese south of Auckland was split from the diocese on 6 March 1980 to form the Roman Catholic Diocese of Hamilton, New Zealand.
The Roman Catholic Diocese of Corner Brook and Labrador is a suffragan of the Archdiocese of St. John's, Newfoundland. It was re-erected as an apostolic vicariate on 28 April 1892 and as the Diocese of Saint George's on 18 February 1904. The Cathedral is located in Corner Brook.
Events from the year 1818 in Ireland.
Thomas Joseph Dowling was a Canadian Roman Catholic priest and the second Bishop of the Roman Catholic Diocese of Peterborough and the fourth Bishop of the Roman Catholic Diocese of Hamilton, Ontario.
Edward Russell Gaines was the Catholic Auxiliary Bishop of Auckland (1976–1981) and was the first bishop of the Roman Catholic Diocese of Hamilton, New Zealand (1980–94).
David Douglas Crosby is a Canadian prelate of the Roman Catholic Church. He is the ninth and current Bishop of Hamilton, having previously served as Bishop of St. George’s Corner Brook, Newfoundland and Labrador (2003–2007) and Bishop of Corner Brook and Labrador (2007–2010). On Thursday, September 17, 2015, during the fall 2015 Plenary Assembly of the Canadian Conference of Catholic Bishops (CCCB), Bishop Crosby was elected President-elect of the Conference; he took office at the end of the fall 2015 Plenary Assembly. At that time, Bishop Crosby succeeded the outgoing President, Archbishop Paul-André Durocher, of the Roman Catholic Archdiocese of Gatineau, in Gatineau, Quebec, Canada. Bishop Crosby is a member of the Missionary Oblates of Mary Immaculate (O.M.I.), though as a bishop his immediate superior is now the Pope. His two-year term as President of the Conference ended in 2017, with the election of Bishop Lionel Gendron of the Roman Catholic Diocese of Saint-Jean-Longueuil in Longueuil, Quebec as President.
The Cathedral of Saint Theresa of Lisieux, or the Cathedral of Saint Theresa of the Little Flower, normally referred to as St. Theresa's Cathedral, is a Roman Catholic cathedral in the City of Hamilton, Bermuda. It is one of two cathedrals in Hamilton, the other being that of the state church, the Anglican church of Bermuda, the Cathedral of the Most Holy Trinity. St. Theresa's is the seat of the Catholic Bishop of Bermuda.
Stephen Marmion Lowe is a New Zealand prelate of the Roman Catholic Church. Since 2015, he has been the Bishop of Hamilton, New Zealand.