List of brigades of the Irish Republican Army
This is a list of brigades of the Irish Republican Army, formed or active between 1916 and 1922, which were involved in activities undertaken by the Irish Republican Army.
Leinster
County Longford
| Period | Brigade | Division | Commandant |
| 1919-1922 | Longford Brigade | 1st Midlands Division | Thomas Reddington |
Ulster
County Fermanagh
No.1 Batt. EnniskillenA. Boho
B. Derrygonnelly
C. Enniskillen
D. Monea
E. Rosinuremore
No.2 Batt. Belcoo
A. Belcoo
B. Doobally
C. Glan Lower
D. Glan Upper
E. Killinagh
F. Mullaghdun