Denmark at the 2017 World Aquatics Championships

In March 2017, Jeanette Ottesen announced that she would not seek qualification for the Championships, as she would focus on the short course season in the fall, culminating in the European Championships on home soil.^[1] Later, Ottesen would go on to announce her pregnancy and a longer hiatus from swimming.^[2]

In April, Mie Nielsen withdrew after having met the qualification criteria for the 50 and 100 metres backstroke, citing a lack of motivation and fatigue following the previous summer's Olympics.^[3]

Danish swimmers have achieved qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the A-standard entry time, and 1 at the B-standard):^[4][5][6]

Men

Women

Athlete	Event	Heat		Semifinal		Final
		Time	Rank	Time	Rank	Time	Rank
Emilie Beckmann	50 m butterfly	25.88	11 Q	25.77	10	did not advance
	100 m butterfly	58.95	20	did not advance
Signe Bro	100 m freestyle	55.40	23	did not advance
	200 m freestyle	2:02.23	27	did not advance
Pernille Blume	50 m freestyle	24.32	2 Q	24.05 NR	2 Q	24.00 NR	4
	100 m freestyle	53.13 NR	2 Q	52.99 NR	4 Q	52.69 NR
Marina Heller Hansen	400 m freestyle	4:18.86	23	—		did not advance
Maj Howardsen	200 m butterfly	2:13.88	28	did not advance
Rikke Møller Pedersen	50 m breaststroke	31.29	17	did not advance
	100 m breaststroke	1:07.39	14 Q	1:07.92	15	did not advance
	200 m breaststroke	2:24.69	7 Q	2:24.51	11	did not advance
Emilie Beckmann Pernille Blume Sarah Bro Signe Bro	4 × 100 m freestyle relay	3:38.29	8 Q	—		3:38.86	8
Sarah Bro Signe Bro Marina Heller Hansen Anina Lund	4 × 200 m freestyle relay	8:06.67	10	—		did not advance

Mixed