The National Aquatic Centre (NAC) (Irish: Ionad Náisiúnta Uisce) is an indoor aquatics facility in Blanchardstown, Fingal, Ireland. The State-owned complex houses a 50-metre swimming pool with an associated diving pool, an aquapark and leisure pool, and a fitness centre.
Since opening in March 2003, the centre has hosted the swimming events of the 2003 Special Olympics World Summer Games, the 2003 European Short Course Swimming Championships and a number of international water polo events. It also hosts the Irish Open Swimming Championships, Irish Senior Water Polo Cup, Irish Open Diving Championships, as well as a number of other national and regional aquatic events.