2021 FINA World Swimming Championships (25 m) – Women's 100 metre backstroke

The heats were started on 16 December at 11:51.[2]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	4	7	Katharine Berkoff	United States	55.92	Q
2	5	4	Kira Toussaint	Netherlands	55.95	Q
3	4	4	Kylie Masse	Canada	56.12	Q
4	5	5	Louise Hansson	Sweden	56.41	Q
5	5	7	Rhyan White	United States	56.76	Q
6	4	3	Simona Kubová	Czech Republic	57.06	Q
7	3	3	Anastasiya Shkurdai	Belarus	57.07	Q
8	3	4	Maaike de Waard	Netherlands	57.09	Q
9	3	1	Wan Letian	China	57.36	Q
10	4	5	Maggie Mac Neil	Canada	57.42	Q
11	5	0	Holly Barratt	Australia	57.72	Q
12	3	7	Peng Xuwei	China	57.82	Q
13	4	6	Silvia Scalia	Italy	58.05	Q
14	3	6	Hanna Rosvall	Sweden	58.33	Q
15	4	1	Anastasia Gorbenko	Israel	58.39	Q
16	1	7	Caroline Pilhatsch	Austria	58.43	Q, NR
17	5	3	Margherita Panziera	Italy	58.46
18	4	2	Ekaterina Avramova	Turkey	58.54
19	3	5	Analia Pigrée	France	58.63
20	5	2	Daria Ustinova	Russian Swimming Federation	59.15
21	5	6	Daryna Zevina	Ukraine	59.36
22	3	8	Stephanie Au	Hong Kong	59.58
23	5	8	Laura Riedemann	Germany	59.64
24	4	0	Nina Kost	Switzerland	59.76
25	3	2	Danielle Hill	Ireland	59.87
26	4	8	Gabriela Georgieva	Bulgaria	59.94
27	5	9	Eszter Szabó-Feltóthy	Hungary	1:00.27
28	5	1	Janja Šegel	Slovenia	1:00.30
29	3	9	Chloe Isleta	Philippines	1:00.42	NR
30	2	4	Andrea Becali	Cuba	1:01.25	NR
31	2	5	Sarah Szklaruk	Chile	1:01.36	NR
32	2	6	Mia Blazhevska Eminova	North Macedonia	1:01.63
33	3	0	Elisabeth Erlendsdóttir	Faroe Islands	1:02.40
34	2	3	Ridhima Veerendrakumar	India	1:03.29
35	2	8	Catarina Sousa	Angola	1:04.12
36	1	8	Leiya Istanbouli	Lebanon	1:05.69
37	2	1	Ganga Senavirathne	Sri Lanka	1:06.06
38	1	1	Arianis Martínez	Panama	1:06.72
39	2	0	Salome Nikolaishvili	Georgia	1:06.97
40	1	3	Leilaa Al-Khatib	United Arab Emirates	1:07.79
41	1	2	Erina Idrizaj	Kosovo	1:08.47
42	1	4	Bisma Khan	Pakistan	1:08.55
43	2	7	Noor Yussuf Abdulla	Bahrain	1:08.72
44	2	9	Lindsay Barr	United States Virgin Islands	1:10.07
45	1	9	Kevern da Silva	Saint Vincent and the Grenadines	1:10.71
46	1	5	Jennifer Harding-Marlin	Saint Kitts and Nevis	1:11.63
47	1	0	Patrice Mahaica	Guyana	1:12.24
48	1	6	Aishath Sausan	Maldives	1:14.03
	2	2	Elizabeth Jiménez	Dominican Republic	DSQ
	4	9	McKenna DeBever	Peru	DNS

The semifinals were started on 16 December at 19:16.[3]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	1	5	Louise Hansson	Sweden	55.85	Q, NR
2	1	4	Kira Toussaint	Netherlands	56.05	Q
2	2	3	Rhyan White	United States	56.05	Q
4	2	5	Kylie Masse	Canada	56.07	Q
5	2	4	Katharine Berkoff	United States	56.10	Q
6	2	6	Anastasiya Shkurdai	Belarus	56.65	Q, NR
7	1	6	Maaike de Waard	Netherlands	56.72	Q
8	1	3	Simona Kubová	Czech Republic	57.26	Q
9	2	7	Peng Xuwei	China	57.36
10	1	1	Anastasia Gorbenko	Israel	57.45	NR
10	2	2	Wan Letian	China	57.45
12	1	2	Holly Barratt	Australia	57.59
13	1	7	Silvia Scalia	Italy	57.62
14	2	1	Hanna Rosvall	Sweden	57.91
15	1	8	Maggie Mac Neil	Canada	58.13
16	2	8	Caroline Pilhatsch	Austria	59.46

The final was held on 17 December at 19:35.[4]

Rank	Lane	Name	Nationality	Time	Notes
	4	Louise Hansson	Sweden	55.20	NR
	6	Kylie Masse	Canada	55.22	NR
	2	Katharine Berkoff	United States	55.40
4	5	Kira Toussaint	Netherlands	55.53
5	3	Rhyan White	United States	55.87
6	1	Maaike de Waard	Netherlands	56.11
7	8	Simona Kubová	Czech Republic	56.68
8	7	Anastasiya Shkurdai	Belarus	56.99