The Roman Catholic Diocese of Corner Brook and Labrador (Latin: Dioecesis Riviangulanensis-Labradorensis) (erected 9 May 1870, as the Prefecture Apostolic of Western Newfoundland) is a suffragan of the Archdiocese of St. John's, Newfoundland.

The Cathedral of the diocese is located in Corner Brook.

The Diocese of Corner Brook and Labrador was erected on 9 May 1870 as the Prefecture Apostolic of Western 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.

In 2007, the diocese was expanded and its name was changed from "St. George's" to "Corner Brook and Labrador".