Open water swimming at the 1998 World Aquatics Championships

The Open Water Swimming events at the 8th FINA World Aquatics Championships were swum in the ocean off Perth, Western Australia on January 6 and 11, 1998. The discipline featured 4 events: a 5-kilometer race, or "5K", for males and females, and a 25-kilometer race (25K) for males and females. It was the first time the 5K was raced a World Championships. The races featured 80 swimmers from 26 nations.