Switzerland competed at the 2023 World Aquatics Championships in Fukuoka, Japan from 14 to 30 July.^[1]

The following is the list of number of competitors participating at the Championships per discipline.

Switzerland entered 4 divers.^[2]

Men

Women

Switzerland entered 1 open water swimmer.^[3]

Men

Switzerland entered 8 swimmers.^[4]

Men

More information Athlete, Event ...

Athlete	Event	Heat		Semifinal		Final
		Time	Rank	Time	Rank	Time	Rank
Jérémy Desplanches	100 metre breaststroke	1:00.95	23	Did not advance
	200 metre individual medley	1:58.00	4 Q	1:58.29	14	Did not advance
Antonio Djakovic	200 metre freestyle	1:46.70	16 Q	1:46.66	14	Did not advance
	400 metre freestyle	3:45.43	8 Q	—		3:44.22	6
Nils Liess	100 metre freestyle	50.24	48	Did not advance
Roman Mityukov	50 metre backstroke	25.61	31	Did not advance
	100 metre backstroke	53.57	6 Q	53.32	10	Did not advance
	200 metre backstroke	1:57.24	2 Q	1:55.85 NR	1 Q	1:55.34 NR
Noè Ponti	50 metre butterfly	23.13	5 Q	23.26	13	Did not advance
	100 metre butterfly	51.00	4 Q	51.17	8 Q	51.23	7
	200 metre butterfly	1:55.85	12 Q	1:55.44	11	Did not advance
Marius Toscan	400 metre individual medley	4:21.24	17	—		Did not advance
Antonio Djakovic Roman Mityukov Noe Ponti Nils Liess	4 × 200 m freestyle relay	7:10.87	14	—		Did not advance
Roman Mityukov Jérémy Desplanches Noè Ponti Antonio Djakovic	4 × 100 m medley relay	3:35.46 NR	15	—		Did not advance

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Women