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

The heats were started on 20 December at 10:12.[2]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	5	4	Louise Hansson	Sweden	56.04	Q
2	5	6	Claire Curzan	United States	56.46	Q
3	5	5	Zhang Yufei	China	56.47	Q, WD
4	3	5	Torri Huske	United States	56.59	Q
5	5	2	Lana Pudar	Bosnia and Herzegovina	56.87	Q
6	4	3	Elena Di Liddo	Italy	56.95	Q
7	5	3	Marie Wattel	France	57.03	Q
8	4	6	Svetlana Chimrova	Russian Swimming Federation	57.04	Q
9	4	2	Maria Ugolkova	Switzerland	57.15	Q
10	3	1	Farida Osman	Egypt	57.18	Q
11	3	7	Giovanna Diamante	Brazil	57.22	Q
12	4	1	Katerine Savard	Canada	57.23	Q, WD
13	5	7	Tessa Giele	Netherlands	57.24	Q
14	4	4	Maggie Mac Neil	Canada	57.32	Q
14	5	9	Ellen Walshe	Ireland	57.32	Q, NR
16	3	2	Ilaria Bianchi	Italy	57.40	Q
17	4	5	Anastasiya Shkurdai	Belarus	57.57	Q
18	3	3	Anna Ntountounaki	Greece	57.60	Q
19	5	8	Anastasiya Kuliashova	Belarus	57.77
20	3	6	Emilie Beckmann	Denmark	57.80
21	4	7	Daria Klepikova	Russian Swimming Federation	57.86
22	4	8	Jeong So-eun	South Korea	58.40
23	3	9	María Mata	Mexico	58.95
24	3	8	Yu Yiting	China	58.96
25	5	1	Laura Lahtinen	Finland	59.05
26	5	0	Chan Kin Lok	Hong Kong	59.46
27	2	4	Luana Alonso	Paraguay	59.68	NR
28	3	0	Tayla Lovemore	South Africa	1:00.20
29	2	3	Lê Thị Mỹ Thảo	Vietnam	1:01.38	NR
29	2	5	Krystal Lara	Dominican Republic	1:01.38
31	2	6	Mariam Sheikhalizadeh	Azerbaijan	1:01.96
32	2	1	Oumy Diop	Senegal	1:02.51
33	2	7	Luna Chabat	Uruguay	1:02.54
34	2	8	Karla Abarca	Nicaragua	1:03.43
35	2	2	Lia Lima	Angola	1:03.94
36	2	9	Antsa Rabejaona	Madagascar	1:05.80
37	2	0	Sara Akasha	United Arab Emirates	1:06.30
38	1	2	Mei-Li Tan Minnich	Cambodia	1:08.68	NR
39	1	6	Dirngulbai Misech	Palau	1:09.42
40	1	5	Mineri Gomez	Guam	1:14.43
41	1	4	Alyse Maniriho	Burundi	1:29.56
	1	3	Mst Sonia Khatun	Bangladesh	DNS
	3	4	Béryl Gastaldello	France
	4	0	Quah Jing Wen	Singapore
	4	9	Tamara Potocká	Slovakia

The semifinals were started on 20 December at 18:32.[3]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	1	7	Maggie Mac Neil	Canada	55.45	Q
2	1	4	Claire Curzan	United States	55.64	Q, =WJ
3	2	4	Louise Hansson	Sweden	55.81	Q
4	2	5	Torri Huske	United States	56.13	Q
5	2	3	Elena Di Liddo	Italy	56.21	Q
6	1	5	Lana Pudar	Bosnia and Herzegovina	56.28	Q, NR
7	2	8	Anastasiya Shkurdai	Belarus	56.42	Q
8	2	2	Farida Osman	Egypt	56.62	Q
9	2	1	Ellen Walshe	Ireland	56.68	NR
10	2	6	Svetlana Chimrova	Russian Swimming Federation	56.78
11	1	8	Anna Ntountounaki	Greece	56.87
12	1	2	Giovanna Diamante	Brazil	56.88
12	2	7	Tessa Giele	Netherlands	56.88
14	1	3	Marie Wattel	France	56.99
15	1	1	Ilaria Bianchi	Italy	57.03
16	1	6	Maria Ugolkova	Switzerland	57.42

The final was held on 21 December at 19:10.[4]

Rank	Lane	Name	Nationality	Time	Notes
	4	Maggie Mac Neil	Canada	55.04	NR
	3	Louise Hansson	Sweden	55.10
	5	Claire Curzan	United States	55.39	WJ
4	6	Torri Huske	United States	55.75
5	2	Elena Di Liddo	Italy	56.34
6	1	Anastasiya Shkurdai	Belarus	56.37
7	7	Lana Pudar	Bosnia and Herzegovina	56.51
8	8	Farida Osman	Egypt	57.01