Women's 400 metre individual medley at the 2019 World Aquatics Championships
Venue	Nambu University Municipal Aquatics Center
Location	Gwangju, South Korea
Dates	28 July (heats and final)
Competitors	26 from 21 nations
Winning time	4:30.39
Medalists
Katinka Hosszú    Hungary   Ye Shiwen    China   Yui Ohashi    Japan
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The Women's 400 metre individual medley competition at the 2019 World Championships was held on 28 July 2019.^[1][2]

Prior to the competition, the existing world and championship records were as follows.

World record	Katinka Hosszú (HUN)	4:26.36	Rio de Janeiro, Brazil	6 August 2016
Competition record	Katinka Hosszú (HUN)	4:29.33	Budapest, Hungary	30 July 2017

The heats were held on 28 July at 10:30.^[3]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	3	4	Katinka Hosszú	Hungary	4:35.40	Q
2	2	4	Yui Ohashi	Japan	4:37.23	Q
3	3	7	Ye Shiwen	China	4:37.66	Q
4	3	1	Emily Overholt	Canada	4:37.90	Q
5	3	3	Ally McHugh	United States	4:38.32	Q
6	3	5	Fantine Lesaffre	France	4:38.40	Q
7	2	6	Sydney Pickrem	Canada	4:38.59	Q
8	2	1	Zsuzsanna Jakabos	Hungary	4:38.93	Q
9	3	6	Brooke Forde	United States	4:39.74
10	2	2	Kim Seo-yeong	South Korea	4:40.55
11	2	3	Aimee Willmott	Great Britain	4:41.24
12	2	7	Anja Crevar	Serbia	4:41.59
13	3	2	Mireia Belmonte	Spain	4:42.16
14	2	0	Yu Yiting	China	4:42.52
15	3	0	Victoria Kaminskaya	Portugal	4:43.03
16	2	5	Ilaria Cusinato	Italy	4:43.27
17	2	8	Viktoriya Zeynep Güneş	Turkey	4:46.01
18	3	9	Jimena Pérez	Spain	4:47.51
19	3	8	Nguyễn Thị Ánh Viên	Vietnam	4:47.96
20	1	2	Katja Fain	Slovenia	4:48.24
21	2	9	Barbora Závadová	Czech Republic	4:48.93
22	1	5	Rebecca Meder	South Africa	4:53.99
23	1	6	Azzahra Permatahani	Indonesia	4:58.19
24	1	7	Maria Fe Muñoz	Peru	4:58.62
25	1	4	Aleksandra Knop	Poland	5:00.77
26	1	3	Claudia Gadea	Romania	5:01.11

The final was held on 28 July at 21:19.^[4]

Rank	Lane	Name	Nationality	Time	Notes
	4	Katinka Hosszú	Hungary	4:30.39
	3	Ye Shiwen	China	4:32.07
	5	Yui Ohashi	Japan	4:32.33
4	1	Sydney Pickrem	Canada	4:36.72
5	6	Emily Overholt	Canada	4:37.42
6	2	Ally McHugh	United States	4:38.34
7	8	Zsuzsanna Jakabos	Hungary	4:39.15
8	7	Fantine Lesaffre	France	4:39.68