| Conflict: | Operation Dagger |
| Partof: | the Iraq War |
| Date: | 18 June 2005 |
| Place: | Western Iraq |
| Result: | US and New Iraqi Army failure, launch of Operation Spear |
| Combatant1: |  United States New Iraqi Army |
| Combatant2: | Iraqi insurgents |
Operation Dagger was a 2005 operation of the Iraq War.[1] It took place in the southern Lake Tharthar region, in Al Anbar province and was conducted by the Regimental Combat Team-8, 2nd Marine Division.
The mission, which was to locate hidden weapons caches and enemy sanctuaries, was a failure. The mission followed Operation Spear, a similar operation.