Swimming at the 2024 World Aquatics Championships – Women's 100 metre backstroke

Prior to the competition, the existing world and championship records were as follows.^[3]

World record	Kaylee McKeown (AUS)	57.33	Budapest, Hungary	21 October 2023
Competition record	Kaylee McKeown (AUS)	57.53	Fukuoka, Japan	25 July 2023

The heats were started on 12 February at 09:32.^[4]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	6	4	Claire Curzan	United States	59.72	Q
2	5	4	Ingrid Wilm	Canada	59.82	Q
3	4	3	Iona Anderson	Australia	59.88	Q
4	4	4	Jaclyn Barclay	Australia	1:00.05	Q
5	6	3	Lauren Cox	Great Britain	1:00.27	Q
6	4	6	Kathleen Dawson	Great Britain	1:00.36	Q
7	4	5	Carmen Weiler	Spain	1:00.44	Q
8	5	3	Kira Toussaint	Netherlands	1:00.50	Q
9	6	5	Maaike de Waard	Netherlands	1:00.61	Q
10	5	5	Adela Piskorska	Poland	1:01.03	Q
11	5	6	Hanna Rosvall	Sweden	1:01.20	Q
12	6	6	Anastasiya Shkurdai		1:01.43	Q
13	6	2	Camila Rebelo	Portugal	1:01.51	Q
14	6	7	Francesca Pasquino	Italy	1:01.54	Q
15	5	8	Gabriela Georgieva	Bulgaria	1:01.65	Q
16	4	2	Stephanie Au	Hong Kong	1:01.80	Q
17	4	0	Carla González	Venezuela	1:01.83
18	5	2	Paulina Peda	Poland	1:01.87
19	5	9	Emma Harvey	Bermuda	1:01.88	NR
20	4	7	Maria Godden	Ireland	1:01.99
21	5	1	Andrea Berrino	Argentina	1:02.02
22	6	9	Jillian Crooks	Cayman Islands	1:02.19
23	5	0	Chen Xin	China	1:02.49
24	4	8	Levenia Sim	Singapore	1:02.72
25	6	1	Song Jae-yun	South Korea	1:02.74
26	4	1	Eszter Szabó-Feltóthy	Hungary	1:02.80
26	5	7	Milla Drakopoulos	South Africa	1:02.80
28	6	8	Teia Salvino	Philippines	1:02.81
29	6	0	Xeniya Ignatova	Kazakhstan	1:02.83
30	3	4	Jana Marković	Serbia	1:03.70
31	3	2	Andrea Becali	Cuba	1:04.22
32	3	6	Celina Márquez	El Salvador	1:04.29
33	3	7	Valerie Tarazi	Palestine	1:04.41
33	4	9	Alexia Sotomayor	Peru	1:04.41
35	3	1	Natalia Zaiteva	Moldova	1:04.50
36	3	9	Donata Katai	Zimbabwe	1:04.51
37	3	3	Carolina Cermelli	Panama	1:04.83
38	3	0	Ganga Senavirathne	Sri Lanka	1:04.93
39	2	4	Suvana Chetana	India	1:05.26
40	2	2	Ariuntamir Enkh-Amgalan	Mongolia	1:05.27
41	3	5	Abril Aunchayna	Uruguay	1:05.31
42	3	8	Masniari Wolf	Indonesia	1:05.39
43	2	3	Gaurika Singh	Nepal	1:05.47
44	2	7	Elizaveta Pecherskikh	Kyrgyzstan	1:05.68
45	2	5	Amani Al-Obaidli	Bahrain	1:06.06
46	2	6	Eda Zeqiri	Kosovo	1:06.64
47	1	4	Idealy Tendrinavalona	Madagascar	1:09.14
48	2	8	Alejandra Santana	Dominican Republic	1:09.27
49	2	0	Chanchakriya Kheun	Cambodia	1:09.31
50	2	9	Riley Miller	U.S. Virgin Islands	1:09.47
51	2	1	Aynura Primova	Turkmenistan	1:09.56
52	1	5	Angelina Smythe	Seychelles	1:10.37
53	1	7	Maleek Al-Mukthar	Libya	1:10.61
54	1	6	Natalia Ladha	Tanzania	1:13.56
55	1	3	Jennifer Harding-Marlin	Saint Kitts and Nevis	1:14.93
56	1	2	Hamna Ahmed	Maldives	1:18.71

The semifinals were held on 12 February at 19:53.^[5]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	2	4	Claire Curzan	United States	58.73	Q
2	1	4	Ingrid Wilm	Canada	59.55	Q
3	1	5	Jaclyn Barclay	Australia	59.83	Q
4	2	5	Iona Anderson	Australia	59.94	Q
5	2	3	Lauren Cox	Great Britain	1:00.03	Q
6	1	6	Kira Toussaint	Netherlands	1:00.37	Q
7	1	3	Kathleen Dawson	Great Britain	1:00.40	Q
8	2	2	Maaike de Waard	Netherlands	1:00.68	Q
9	2	6	Carmen Weiler	Spain	1:00.81
10	2	1	Camila Rebelo	Portugal	1:00.91
11	1	2	Adela Piskorska	Poland	1:00.99
12	1	7	Anastasiya Shkurdai		1:01.24
13	2	8	Gabriela Georgieva	Bulgaria	1:01.42
14	1	8	Stephanie Au	Hong Kong	1:01.50
15	2	7	Hanna Rosvall	Sweden	1:01.67
16	1	1	Francesca Pasquino	Italy	1:01.68

The final were was on 13 February at 19:51.^[6]

Rank	Lane	Name	Nationality	Time	Notes
	4	Claire Curzan	United States	58.29
	6	Iona Anderson	Australia	59.12
	5	Ingrid Wilm	Canada	59.18
4	3	Jaclyn Barclay	Australia	59.28
5	2	Lauren Cox	Great Britain	59.60
6	1	Kathleen Dawson	Great Britain	1:00.42
7	8	Maaike de Waard	Netherlands	1:00.64
8	7	Kira Toussaint	Netherlands	1:00.73