Finland competed at the 2023 World Aquatics Championships in Fukuoka, Japan from 14 to 30 July.
Diving
Finland entered 1 diver.
Women AthleteEventPreliminariesSemifinalFinalPointsRankPointsRankPointsRank Lauren Hallaselkä 1 m springboard 227.50 20colspan=2 Did not advance 3 m springboard 193.35 45 Did not advance
Swimming
Finland entered 5 swimmers.
Men AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRank Olli Kokko 50 metre breaststroke 27.99 29 Did not advance Matti Mattsson 100 metre breaststroke 1:00.62 20 Did not advance 200 metre breaststroke 2:11.00 14 Q 2:09.93 10 Did not advance
Women AthleteEventHeatSemifinalFinalTimeRankTimeRankTimeRank Ida Hulkko 50 metre breaststroke 30.98 21 Did not advance 100 metre breaststroke 1:07.58 24 Did not advance Veera Kivirinta 50 metre breaststroke 30.33 6 Q 30.56 13 Did not advance Laura Lahtinen 200 metre breaststroke 2:35.16 27 Did not advance 100 metre butterfly 1:00.56 31 Did not advance 200 metre butterfly2:13.6525Did not advance
References