The 2019 International Swimming League was the inaugural edition of the International Swimming League, a professional swimming league, established in 2019. It comprised eight teams composed of both women and men. The league consisted of seven short course swimming meets which took place in seven cities around the world.

The International Swimming League (ISL) is an annual professional swimming league, established in 2019. It features a team-based competition format with fast-paced race sessions. In 2019, the regular season started in October and the Final Match was held in December.