Swimming at the 2023 World Aquatics Championships – Women's 50 metre backstroke

The heats were started on 26 July at 10:32.[5]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	6	4	Regan Smith	United States	27.31	Q
2	5	4	Kylie Masse	Canada	27.48	Q
3	7	4	Katharine Berkoff	United States	27.56	Q
4	6	5	Kaylee McKeown	Australia	27.60	Q
5	7	2	Mary-Ambre Moluh	France	27.69	Q
6	5	5	Ingrid Wilm	Canada	27.75	Q
7	6	3	Wan Letian	China	27.84	Q
7	7	1	Miki Takahashi	Japan	27.84	Q
9	6	6	Wang Xueer	China	27.89	Q
10	5	3	Maaike de Waard	Netherlands	27.91	Q
11	7	6	Lauren Cox	Great Britain	27.98	Q
12	7	5	Analia Pigrée	France	28.01	Q
13	5	1	Danielle Hill	Ireland	28.03	Q
14	6	2	Simona Kubová	Czech Republic	28.14	Q
15	6	7	Theodora Drakou	Greece	28.20	Q
16	5	9	Andrea Berrino	Argentina	28.24	Q
17	5	8	Lora Komoróczy	Hungary	28.29
18	7	7	Adela Piskorska	Poland	28.35
19	5	0	Lee Eun-ji	South Korea	28.40
19	6	1	Paulina Peda	Poland	28.40
21	5	6	Kira Toussaint	Netherlands	28.41
22	6	0	Louise Hansson	Sweden	28.42
23	6	8	Costanza Cocconcelli	Italy	28.51
24	7	9	Carmen Weiler Sastre	Spain	28.59
25	7	0	Margherita Panziera	Italy	28.61
26	4	4	Ingeborg Løyning	Norway	28.62
27	6	9	Stephanie Au	Hong Kong	28.63
28	4	2	Camila Rebelo	Portugal	28.65
29	5	7	Roos Vanotterdijk	Belgium	28.69
30	7	8	Julie Kepp Jensen	Denmark	28.77
31	4	7	Emma Harvey	Bermuda	28.79
32	4	6	Tayde Sansores	Mexico	28.91
33	4	5	Nina Kost	Switzerland	29.00
34	4	3	Julia Góes	Brazil	29.09
35	4	0	Xeniya Ignatova	Kazakhstan	29.25
36	3	4	Wu Yi-en	Chinese Taipei	29.28
37	4	8	Milla Drakopoulos	South Africa	29.31
38	4	1	Saovanee Boonamphai	Thailand	29.46
39	3	2	Elisabeth Erlendsdóttir	Faroe Islands	29.94
40	4	9	Abril Aunchayna	Uruguay	30.04
41	3	5	Alexia Sotomayor	Peru	30.12
42	2	9	Mia Phiri	Zambia	30.17	NR
43	3	6	Donata Katai	Zimbabwe	30.21
44	3	3	Mia Blazhevska Eminova	North Macedonia	30.41
45	3	1	Eda Zeqiri	Kosovo	30.96
46	3	7	Marie Khoury	Lebanon	31.14
47	1	6	Gaurika Singh	Nepal	31.44
48	3	8	Nubia Adjei	Ghana	31.61
49	3	0	Chanchakriya Kheum	Cambodia	31.90
50	2	4	Denise Donelli	Mozambique	32.39
51	2	8	Idealy Tendrinavalona	Madagascar	32.41
52	2	7	Cheang Weng Lam	Macau	32.48
53	3	9	Ariuntamir Enkh-Amgalan	Mongolia	32.54
54	2	0	Shoko Litulumar	Northern Mariana Islands	34.25
55	1	4	Ria Save	Tanzania	34.71
56	2	1	Kayla Hepler	Marshall Islands	34.73
57	2	5	Hamna Ahmed	Maldives	35.11
58	2	6	Noelani Malia Day	Tonga	35.37
59	2	3	Nafissath Radji	Benin	35.40
60	2	2	Tayamika Chang'Anamuno	Malawi	36.03
61	1	3	Rana Saadeldin	Sudan	36.32	NR
	1	5	Ruth Turay	Sierra Leone	Did not start
	5	2	Anastasia Gorbenko	Israel
	7	3	Mollie O'Callaghan	Australia

The semifinals were started on 26 July at 20:36.[6]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	2	4	Regan Smith	United States	27.10	Q, AM
2	1	5	Kaylee McKeown	Australia	27.26	Q
3	2	7	Lauren Cox	Great Britain	27.29	Q
4	1	4	Kylie Masse	Canada	27.49	Q
4	2	5	Katharine Berkoff	United States	27.49	Q
6	1	7	Analia Pigrée	France	27.70	Q
7	1	3	Ingrid Wilm	Canada	27.71	Q
8	2	2	Wang Xueer	China	27.74
8	2	6	Wan Letian	China	27.74
10	2	3	Mary-Ambre Moluh	France	27.82
11	2	8	Theodora Drakou	Greece	27.87	NR
12	1	2	Maaike de Waard	Netherlands	28.03
13	2	1	Danielle Hill	Ireland	28.10
14	1	6	Miki Takahashi	Japan	28.13
15	1	1	Simona Kubová	Czech Republic	28.16
16	1	8	Andrea Berrino	Argentina	28.34

The swim-off was held on 26 July at 22:14.[7]

Rank	Lane	Name	Nationality	Time	Notes
1	4	Wang Xueer	China	27.78	Q
2	5	Wan Letian	China	27.90

The final was held on 27 July at 20:36.[8]

Rank	Lane	Name	Nationality	Time	Notes
	5	Kaylee McKeown	Australia	27.08	OC
	4	Regan Smith	United States	27.11
	6	Lauren Cox	Great Britain	27.20
4	3	Kylie Masse	Canada	27.28
5	2	Katharine Berkoff	United States	27.38
6	1	Ingrid Wilm	Canada	27.41
7	8	Wang Xueer	China	27.99
8	7	Analia Pigrée	France	28.04