Ireland competed at the 2011 World Championships in Athletics from August 27 to September 4 in Daegu, South Korea, and during this event, only two men out of the six men from Ireland finished the finals, and they were  Ciaran O'Lionaird (1500 meters) and Alistair Ian Cragg (5000 meters).
It started on 27 August 2011 and finished on 4 September 2011. The 13th IAAF World Championships in Athletics (Korean: [13 ) was an international athletics competition that was held in Daegu, South Korea. 
