The eighth edition of the Pan Pacific Swimming Championships, a long course (50 m) event, was held in 1999 at the Sydney International Aquatic Centre in Sydney, Australia, from 22–29 August. Only two swimmers per country could compete in finals, and only four swimmers per country could compete in semi-finals.

Joshua Clark Davis is an American former competition swimmer, Olympic gold medalist, and former world record-holder. Davis represented the United States at two consecutive Summer Olympics.