The 2018 Oceania Swimming Championships was held from 25 to 30 June 2018 at the Taurama Aquatic Centre in Port Moresby, Papua New Guinea. It was the twelfth edition of the biennial championships as well as the first to be held in Port Moresby. The tournament featured competition in swimming and open water swimming.
A total of sixteen teams have confirmed participation for the 2018 Oceania Swimming Championships: