The Roman Catholic Diocese of Timmins (Latin: Dioecesis Timminsensis) (erected 21 September 1908, as the Vicariate Apostolic of Temiskaming) is a suffragan of the Archdiocese of Ottawa.
The Vicariate Apostolic of Temiskaming was set up bounded on the north by Hudson Bay and the Great Whale River; on the south by the height of land, or watershed, except in the Temiskaming district, where the southern boundary is 47° N.
Annual visits were made, missions being held at the Hudson's Bay Company's trading posts.
Haileybury, Ontario was the residence of the first vicar Apostolic, Elie-Anicet Latulipe.
He was named Titular Bishop of Catenna and first Vicar-Apostolic of Temiskaming on 1 October 1908, and consecrated on 30 November 1908.