| 2nd/11th (County Armagh) Battalion, Ulster Defence Regiment | |
|---|---|
 Regimental Insignia | |
| Active | 1991–1992 |
| Country |  United Kingdom |
| Branch |  British Army |
| Type | Infantry battalion |
| Role | Internal Security |
| Size | 750 |
| Regimental Headquarters | Lisburn |
| Motto(s) | "Quis Separabit" (Latin) "Who Shall Separate Us?" |
| March | (Quick) Garryowen & Sprig of Shillelagh. (Slow) Oft in the Stilly Night |
| Commanders | |
| Colonel Commandant | First: General Sir John Anderson GBE, KCB, DSO. Last: General Sir Charles Huxtable, KCB, CBE, DL |
| Colonel of the Regiment | Colonel Sir Dennis Faulkner CBE |
The 2nd//11th (County Armagh) Battalion, Ulster Defence Regiment was formed in 1991 as a result of an amalgamation between the 2nd Battalion Ulster Defence Regiment and the 11th Battalion Ulster Defence Regiment. The resultant 2/11 UDR was subsumed into the Royal Irish Rangers in 1992 as part of the Options for Change amalgamations and was renamed the 6th Battalion Royal Irish Regiment.