Ireland competed at the 2023 World Aquatics Championships in Fukuoka, Japan from 14 to 30 July.

Diving

Ireland entered three divers.

Men AthleteEventPreliminariesSemifinalsFinalPointsRankPointsRankPointsRank Jake Passmore 1 m springboard 344.60 17 colspan=2 Did not advance 3 m springboard 319.65 45Did not advance

Women AthleteEventPreliminariesSemifinalsFinalPointsRankPointsRankPointsRank Clare Cryan 1 m springboard 229.50 17 colspan=2 Did not advance 3 m springboard 289.55 9 Q 283.45 17Did not advance Ciara McGing 10 m platform244.90 28Did not advance

Mixed AthleteEventFinalPointsRank Clare Cryan Jake Passmore 3 m synchronized springboard 237.18 15

Swimming

Ireland entered 12 swimmers.

Men AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRank Tom Fannon 50 metre freestyle 22.13 20 Did not advance Conor Ferguson 50 metre backstroke 24.95 11 25.09 13 Did not advance 100 metre backstroke 54.36 22 Did not advance Darragh Greene50 metre breaststroke 27.54 22 Did not advance 100 metre breaststroke 1:00.54 19 Did not advance 200 metre breaststroke 2:12.21 18 Did not advance Max McCusker 100 metre butterfly 53.46 40 Did not advance Shane Ryan 100 metre freestyle 49.04 33 Did not advance John Shortt 200 metre backstroke 1:59.79 22 Did not advance Daniel Wiffen 800 metre freestyle 7:43.81 NR 4 Q colspan=2 7:39.19 ER 4 1500 metre freestyle 14:43.50 2 Q colspan=2 14:43.01 4 Conor FergusonDarragh Greene Max McCusker Shane Ryan 4 × 100 m medley relay 3:35.03 13 colspan="2" Did not advance

Women AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRank Victoria Catterson 100 metre freestyle 55.56 26 Did not advance 200 metre freestyle 2:00.82 31 Did not advance Danielle Hill 50 metre freestyle 25.55 30 Did not advance50 metre backstroke28.0313 Q28.1010 Did not advance100 metre backstroke1:01.5127 Did not advance 50 metre butterfly 26.90 30 Did not advance Mona McSharry50 metre breaststroke 30.45 12 Q 30.54 11 Did not advance100 metre breaststroke 1:05.55 NR 2 Q 1:05.96 4 Q 1:06.07 5200 metre breaststroke 2:26.59 16 Q 2:26.27 15 Did not advance Ellen Walshe 100 metre butterfly 59.39 24 Did not advance 200 metre individual medley 2:12.83 16 Q 2:10.92 9 Did not advance 400 metre individual medley 4:43.24 16 colspan=2 Did not advance Mona McSharry Danielle Hill Erin Riordan Victoria Catterson freestyle relay 3:41.75 NR 15 colspan=2 Did not advance Danielle Hill Mona McSharryEllen WalsheVictoria Catterson 4 × 100 m medley relay 4:01.25 NR 13 colspan=2 Did not advance

References