# 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.

## Munster
### County Clare

| Period | Brigade | Division | Commandant |
| 1916–1917 | East Clare Brigade | | Michael Brennan |
| 1916–1917 | Mid Clare Brigade | | Sean McNamara |
| 1916–1917 | North Clare Brigade | | H. J. Hunt |
| 1916–1917 | West Clare Brigade | | E. Fennell |
| 1917–1918 | Clare Brigade | | Patrick Brennan |
| 1918–1922 | East Clare Brigade | 1st Western Division | Michael Brennan |
| 1918–1922 | Mid Clare Brigade | 1st Western | Frank Barrett |
| 1918–1922 | West Clare Brigade | 1st Western | Art O'Donnell |

### County Cork

| Period | Brigade | Division | Commandant |
| 1914-1919 | Cork Volunteers | 1st Southern Division | Tomás Mac Curtain |
| 1919-1920 | 1st Cork Brigade | 1st Southern Division | Tomás Mac Curtain |
| 1920 | 1st Cork Brigade | 1st Southern Division | Terence MacSwiney |
| 1920-1922 | 1st Cork Brigade | 1st Southern Division | Sean O'Hegarty |
| 1919-1921 | 2nd Cork Brigade (North Cork Brigade) | 1st Southern Division | Liam Lynch |
| 1921 | 2nd Cork Brigade (North Cork Brigade) | 1st Southern Division | Sean Moylan |
| 1921 | 2nd Cork Brigade (North Cork Brigade) | 1st Southern Division | George Power |
| 1919-1920 | 3rd Cork Brigade (West Cork Brigade) | 1st Southern Division | Tom Hales |
| 1920-1921 | 3rd Cork Brigade (West Cork Brigade) | 1st Southern Division | Charlie Hurley |
| 1921-22 | 3rd Cork Brigade (West Cork Brigade) | 1st Southern Division | Tom Barry |
| 1921 | 4th Cork Brigade | 1st Southern Division | Paddy O'Brien |
| 1921-1922 | 4th Cork Brigade | 1st Southern Division | Sean Moylan |
| 1921-1922 | 5th Cork Brigade | 1st Southern Division | Gibbs Ross |

### County Kerry

| Period | Brigade | Division | Commandant |
| 1914-1917 | Kerry Brigade | 1st Southern Division | Austin Stack |
| 1917-1919 | 1st Kerry Brigade | 1st Southern Division | Austin Stack |
| 1919–1921 | 1st Kerry Brigade | 1st Southern Division | Patrick Cahill |
| 1921 | 1st Kerry Brigade | 1st Southern Division | Andrew Cooney |
| 1921-1922 | 1st Kerry Brigade | 1st Southern Division | Humphrey Murphy |
| -1921 | 2nd Kerry Brigade | 1st Southern Division | Dan Mahony |
| 1921 | 2nd Kerry Brigade | 1st Southern Division | Humphrey Murphy |
| 1922 | 2nd Kerry Brigade | 1st Southern Division | John Joe Rice |

### County Tipperary

| Period | Brigade | Division | Commandant |
| 1918-1922 | 3rd Tipperary Brigade | 2nd southern division | Séumas Robinson |

### County Waterford
## Leinster
### County Longford

| Period | Brigade | Division | Commandant |
| 1919-1922 | Longford Brigade | 1st Midlands Division | Thomas Reddington |

### County Offaly

| Period | Brigade | Division | Commandant |
| 1920-1922 | Offaly Brigade | 1st Eastern Division | Barry Byrne |

### County Wicklow
## Ulster
### County Antrim

| Period | Brigade | Division | Commandant |
| 1916–1922 | Belfast Brigade | 3rd Northern | Sean Cusack & Joe McKelvey |

### County Cavan

| Period | Brigade | Division | Commandant |
| 1916–1921 | Cavan Brigade | Ulster | Pat Woods |
| 1921–1922 | East Cavan Brigade | 5th Northern | Peadar McMahon, Seán Gallagher & Séamus McGovern |
| 1921–1922 | West Cavan Brigade | 6th Northern | Éamonn McGovern, Michael MacManus & Seán Dolan |

### County Donegal

| Period | Brigade | Division |
| –1922 | West Donegal Brigade | 1st Northern Division |
| –1922 | North East Donegal Brigade | 1st Northern |
| –1922 | South West Donegal Brigade | 1st Northern |
| –1922 | South East Donegal Brigade | 1st Northern |

### County Fermanagh

No.1 Batt. Enniskillen A. 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

### County Monaghan

| Period | Brigade | Division | Commandant |
| 1916–1922 | Monaghan Brigade | 5th Northern Division | Eoin O'Duffy |

### County Tyrone
## Connacht
### County Galway

| Period | Brigade | Division | Commandant |
| 1916–1920 | Galway Brigade | | |
| 1920–1922 | South East Galway Brigade | 1st Western | Joeseph Stanford |
| 1920–1922 | North Galway Brigade | 2nd Western Division | |
| 1920–1922 | West Galway Brigade | 4th Western Division | Peter Joe McDonnell |

### County Mayo

| Period | Brigade | Division | Commandant |
| | 1 West Mayo Brigade | 4th Western Division | Ned Mohan |
| | 2 North Mayo Brigade | 4th Western Division | C. Mackin ; Séamus Kilcullen |
| 1922- | 5 North West Mayo | 4th Western Division | Anthony Farrell |
| | East Mayo | 3rd Western Division | |

### County Sligo
## Other

| Brigade | Division |
| 1st Scottish Brigade | 1st Scottish |
| 2nd Scottish Brigade | 1st Scottish |
| Liverpool Battalion | |
| London Battalion | |
| Newcastle-on-Tyne Battalion | |
| Q Company GHQ | |