| Conflict: | Siege of Dublin |
| Partof: | the Anglo-Norman invasion of Ireland |
| Date: | August–September 1171 |
| Place: | City of Dublin |
| Result: | Anglo-Norman victory |
| Combatant2: | Angevin Empire |
| Commander1: | Ruaidrí Ua Conchobair |
| Commander2: | Richard de Clare |
| Strength1: | 60,000 (allegedly) |
| Strength2: | 500–600 |
| Casualties1: | 1,500 killed |
| Casualties2: | 1 wounded |
The siege of Dublin was an unsuccessful attempt of the last high king of Ireland, Ruaidrí Ua Conchobair, to capture the City of Dublin from the Anglo-Normans in 1171.
Ua Conchobair was allegedly able to gather sixty-thousand men for his cause, meanwhile, the city was held by Strongbow; who had proven his martial prowess just a few months prior, when another Irish army had attempted to seize the city, but Strongbow had been able to drive the besiegers off with a sally.
Ua Conchobair divided his forces into four camps and during the night Strongbow led a surprise attack on Ua Conchobair's camp, killing a thousand and a half, causing the rest of Irish forces to rout.[1]