Guatemala competed at the 2019 World Aquatics Championships in Gwangju, South Korea from 12 to 28 July.
Open water swimming
Guatemala qualified one male and one female open water swimmers.
Men AthleteEventTimeRankSantiago ReyesMen's 5 km1:01:51.757Men's 10 km2:08:27.569
Women AthleteEventTimeRankYanci VanegasWomen's 5 km1:06:24.450Women's 10 km2:11:59.156
Swimming
Guatemala entered four swimmers.
Men AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRankErick Gordillo200 m backstroke2:05.5338did not advance400 m individual medley4:28.5729colspan=2did not advanceFernando Ponce100 m butterfly58.2666did not advance200 m butterfly2:07.6145did not advance
Women AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRankDaila Ismatul50 m freestyle28.3165did not advance400 m freestyle4:34.7537colspan=2did not advanceGabriela Santis100 m freestyle58.9350did not advance200 m freestyle2:05.3636did not advance
References