The Roman Catholic Diocese of Brechin, also known as the Diocese of Angus, was one of the thirteen pre-Reformation dioceses of Scotland.

The diocese was believed to have been founded by Bishop Samson in 1153, and based at the cathedral in Brechin, Angus.

At the Reformation, the cathedral, churches and jurisdiction of the diocese were transferred to the Church of Scotland, its line of episcopacy having been continued without breaks by the Scottish Episcopal Church, which separated from the Church of Scotland in 1690.

The Diocese has been led by the Bishop of Brechin (Episcopal), sole successor to the early Catholic Bishop of Brechin.

1. Brechin (Cathedral)
2. Buthergill (now Burghill)
3. Catterline
4. Cortachy
5. Crebyauch (now Kirkbuddo)
6. Dun
7. Dundee
8. Dunnichen
9. Farnell
10. Fothenevyn (now Finavon or Oathlaw)
11. Glenbervie
12. Glenisla
13. Guthrie
14. Kilmoir
15. Kingornie
16. Kingoldrum
17. Lethnot
18. Maryton
19. Menmuir
20. Monikie
21. Montrose
22. Navar
23. Panbride
24. Stracathro
25. Strathmartine

and in the Mearns

1. Garvock
2. Strachan