El Salvador competed at the 2023 World Aquatics Championships in Fukuoka, Japan from 14 to 30 July.
Open water swimming
El Salvador entered 1 open water swimmer.
Women AthleteEventTimeRank Fátima Portillo Women's 5 km Women's 10 km
Swimming
El Salvador entered 2 swimmers.
Men AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRank José Campo 400 metre freestyle 4:15.97 51 colspan="2" Did not advance 800 metre freestyle 8:57.60 38 colspan="2" Did not advance
Women AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRank Isabella Alas 100 metre freestyle 1:00.58 48 Did not advance 100 metre butterfly 1:02.85 39 Did not advance
References