| Unit Name: | 1st Brigade |
| Native Name: | Irish: 1ú Briogáid |
| Country: |  Ireland |
| Branch: | Army |
| Command Structure: | Defence Forces |
| Current Commander: | Brigadier General Brian Cleary[1] |
| Garrison: | Collins Barracks, Cork |
| Identification Symbol Label: | Flag |
The 1st Brigade (1 BDE) (Irish: 1ú Briogáid) is a brigade of the Irish Army. The brigade, which was known as 1st (Southern) Brigade until the 2012 reorganisation of the army, has its headquarters in Collins Barracks in Cork. The 1st Brigade is responsible for military operations in the south of Ireland. Its area of responsibility includes the counties of Galway, Offaly, Laois, Carlow, Kilkenny, Wexford, Waterford, Cork, Kerry, Limerick and Tipperary.
It is also responsible for the security of a number of "vital installations" including civil transport infrastructure sites such as Cork Harbour, Cork Airport, Shannon Airport and Farranfore Airport.[2] [3]