Swimming at the 2009 World Aquatics Championships – Women's 50 metre butterfly

The heats for the women's 50 m butterfly race at the 2009 World Championships took place in the morning and evening of 31 July, with the final in the evening session of 1 August at the Foro Italico in Rome, Italy.

Prior to this competition, the existing world and competition records were as follows:

World record	Marleen Veldhuis (NED)	25.33	Amsterdam, Netherlands	19 April 2009
Championship record	Therese Alshammar (SWE)	25.82	Melbourne, Australia	30 March 2007

The following records were established during the competition:

Date	Round	Name	Nationality	Time	Record
31 July	Heat 10	Sarah Sjöström	Sweden	25.74	CR
31 July	Heat 13	Therese Alshammar	Sweden	25.44	CR
31 July	Semifinal 1	Marleen Veldhuis	Netherlands	25.28	WR
31 July	Semifinal 2	Therese Alshammar	Sweden	25.07	WR

Rank	Name	Nationality	Time	Heat	Lane	Notes
1	Therese Alshammar	Sweden	25.44	13	4	CR, NR
2	Marleen Veldhuis	Netherlands	25.58	14	4
3	Ingvild Snildal	Norway	25.62	13	7	NR
4	Sarah Sjöström	Sweden	25.74	10	3
5	Marieke Guehrer	Australia	25.83	14	5
6	Silvia di Pietro	Italy	25.84	13	6	NR
7	Jeanette Ottesen	Denmark	25.86	14	3	NR
8	Yafei Zhou	China	26.00	14	2	AS
9	Christine Magnuson	United States	26.06	13	5
10	Gabriella Silva	Brazil	26.07	13	2	SA
11	Daynara de Paula	Brazil	26.11	13	8
12	Hinkelien Schreuder	Netherlands	26.21	12	5
12	Sviatlana Khakhlova	Belarus	26.21	14	8
14	Triin Aljand	Estonia	26.27	14	9
15	Diane Bui Duyet	France	26.35	14	6
16	Daniela Samulski	Germany	26.36	12	8
17	Dara Torres	United States	26.41	12	4
17	Libby Trickett	Australia	26.41	13	3
19	Yuka Kato	Japan	26.46	12	1
20	Irina Bespalova	Russia	26.49	12	2	NR
21	Jiao Liuyang	China	26.53	12	3
22	Fabienne Nadarajah	Austria	26.55	14	7
23	Amit Ivry	Israel	26.59	12	7
23	Iryna Niafedava	Belarus	26.59	13	9
25	Eszter Dara	Hungary	26.68	11	4	NR
26	Jemma Lowe	Great Britain	26.71	11	8
26	Mélanie Henique	France	26.71	12	6
28	Tao Li	Singapore	26.76	10	5
29	Katharina Stiberg	Norway	26.77	12	0
30	Micha Kathrine Østergaard Jensen	Denmark	26.79	11	3
31	Martina Moravcová	Slovakia	26.80	12	9
32	Cristina Maccagnola	Italy	26.82	14	1
33	Kimberly Buys	Belgium	26.85	14	0
34	Alana Dillette	Bahamas	27.07	13	9	NR
35	Beatrix Bordas	Hungary	27.13	13	1
36	Yui Miyamoto	Japan	27.16	11	6
37	Emilia Pikkarainen	Finland	27.23	11	5
38	Ellen Gandy	Great Britain	27.28	11	2
39	Victoria Poon	Canada	27.31	13	0
40	Katarina Listopadova	Slovakia	27.37	10	4
41	Jane Trepp	Estonia	27.39	10	9
42	Anna Schoholeva	Cyprus	27.43	11	0
43	Iris Rosenberger	Turkey	27.44	10	8
44	Fella Bennaceur	Algeria	27.50	10	6	NR
45	Audrey Lacroix	Canada	27.52	9	5
45	Kelly Shim Robinson	Hong Kong	27.52	9	0
47	Linda Laihorinne	Finland	27.53	9	7
48	Carolina Colorado Henao	Colombia	27.56	11	7
49	Laetitia Perez	Switzerland	27.61	11	1
50	Farida Osman	Egypt	27.78	9	3
51	Sofija Djelic	Slovenia	27.82	9	2
52	Kristina Tchernychev	Israel	27.88	9	6
53	Binta Zahra Diop	Senegal	27.96	9	9
54	Rita Medrano	Mexico	27.97	8	5	NR
55	Marellyn Lammert Liew	Malaysia	27.98	9	8
56	Hang Yu Sze	Hong Kong	28.12	9	1
57	Aneta Pechancova	Czech Republic	28.18	9	4
58	Jeserick Pinto	Venezuela	28.20	10	1
59	Klara Vaclavikova	Czech Republic	28.23	7	5
60	Sharntelle McLean	Trinidad and Tobago	28.25	8	3
61	Christine Mailliet	Luxembourg	28.36	8	6
62	Grite Apanaviciute	Lithuania	28.38	10	0
63	Mylene Ong	Singapore	28.48	8	4
64	Marie Laura Meza	Costa Rica	28.58	7	4	NR
65	Aiste Dobrovolskaite	Lithuania	28.62	8	2
65	Nadia Colovini	Argentina	28.62	10	2	NR
67	Monica Bernardo	Mozambique	28.88	7	3
68	Ramond Sherazad	Morocco	29.01	7	1	NR
69	Gizem Cam	Turkey	29.16	8	7
70	Ma Cheok Mei	Macau	29.21	8	8
71	Achieng Ajulu-Bushell	Kenya	29.32	7	2	NR
72	Nishani Cicilson	Suriname	29.34	6	3
73	Dalia Torrez	Nicaragua	29.35	7	7
74	Chittaranjan Shubha	India	29.48	7	8
75	Veronica Vdovicenco	Moldova	29.50	7	6
76	Silvie Ketelaars	Netherlands Antilles	29.53	6	6
77	Shaila Millum Garðarnar	Faroe Islands	29.56	6	2	NR
78	Maria Georgina Gandionco	Philippines	29.60	7	1
79	Karen Milenka Torrez Guzman	Bolivia	29.63	6	4
80	Razan Taha	Jordan	29.66	8	9
81	Kimberley Eeson	Zimbabwe	29.69	5	1
82	Laura lucia Paz Chavez	Honduras	29.72	5	8
83	Moira Fraser	Zimbabwe	29.85	5	6
84	Jonay Briedenhann	Namibia	29.86	6	7	NR
85	Ileana Murillo	El Salvador	30.05	8	1
86	Marianela Quesada	Costa Rica	30.12	5	0
87	Karrakchou Lilia	Morocco	30.13	4	5
88	Kendese Nangle	Jamaica	30.18	6	5
89	Davina Mangion	Malta	30.24	6	9
90	Kathryn Millin	Eswatini	30.29	3	2
91	Nilshaira Isenia	Netherlands Antilles	30.33	5	2
92	Long Chi Wun	Macau	30.47	7	0
93	Karla Toscano	Guatemala	30.50	4	5
94	Ashley Bransford	Aruba	30.53	5	7
95	Labake Anthonia Oriretan	Nigeria	30.63	3	7
96	Vandita Dhariyal	India	30.65	3	6
96	Amina Meho	Lebanon	30.65	6	1
98	Selma Atic	Bosnia and Herzegovina	30.74	8	0
99	Sharon Paola Fajardo Sierra	Honduras	30.79	5	5
100	Li Chuen Cheong Estelle	Mauritius	30.97	4	4
101	Graciela Peinado Ibanez	Bolivia	31.05	2	2
102	Talisa Pace	Malta	31.06	6	0
103	Stephanie Rasoamanana	Madagascar	31.30	3	4
104	Gessica Stagno	Mozambique	31.33	3	8
105	Pina Ercolano	Kenya	31.35	4	6
105	Adele Rova	Fiji	31.35	4	0
107	Sara Abdullahu	Albania	31.41	4	9
108	Estellah Fils Rabetsara	Madagascar	31.45	4	2
109	Noelyn Faussane	French Polynesia	31.69	3	0
110	Cheyenne Rova	Fiji	31.79	4	1
111	Tin Hon Ko Adeline Mei-Li	Mauritius	31.80	4	3
112	Shannon Austin	Seychelles	31.92	2	2
113	Miniruwani Samarakoon	Sri Lanka	32.14	3	1
114	Danielle Bernadine Findlay	Zambia	32.17	3	3
115	Ruth Carvalho	Angola	32.20	2	5
115	Julia Alves	Marshall Islands	32.20	2	7
117	Noelle Anyika Smith	Seychelles	32.34	2	8
118	Sabine Hazboun	Palestine	32.39	2	4
119	Maria Grace Koh	Brunei	32.59	4	8
120	Amnahliyani Mohamad Husain	Brunei	32.65	2	1
121	Judith Ilan Meauri	Papua New Guinea	32.82	3	9
122	Debra Daniel	Federated States of Micronesia	32.83	2	6
123	Debora Keci	Albania	32.92	3	5
124	Kiran Khan	Pakistan	33.13	5	3
125	Yara Dowani	Palestine	33.64	6	8
126	Sausan Aishath	Maldives	33.76	1	5
127	Mariam Foum	Tanzania	34.67	1	3
128	Julianne Kirchner	Marshall Islands	34.96	1	2
129	Katerina Izmailova	Tajikistan	36.63	5	4
130	Rida Mitha	Pakistan	37.54	2	9
131	Uwamahoro Elsie	Burundi	43.87	2	0
132	Awa Keita	Mali	44.33	1	6
–	Ana Euceda Gutierrez	Honduras	DNS	5	9
–	Gantumur Oyungerel	Mongolia	DSQ	1	4
–	Loren Yamile Bahamonde	Ecuador	DSQ	11	9

Rank	Name	Nationality	Time	Heat	Lane	Notes
1	Therese Alshammar	Sweden	25.07	2	4	WR
2	Marleen Veldhuis	Netherlands	25.28	1	4	NR
3	Ingvild Snildal	Norway	25.53	2	5	NR
4	Marieke Guehrer	Australia	25.58	2	3	OC
5	Yafei Zhou	China	25.59	1	6	AS
6	Sarah Sjöström	Sweden	25.76	1	5
7	Daynara de Paula	Brazil	25.85	2	7	SA
8	Diane Bui Duyet	France	25.87	2	8	NR
9	Jeanette Ottesen	Denmark	25.90	2	6
10	Hinkelien Schreuder	Netherlands	25.94	1	7
11	Silvia di Pietro	Italy	26.00	1	3
12	Sviatlana Khakhlova	Belarus	26.00	2	1
13	Gabriella Silva	Brazil	26.02	1	2
14	Triin Aljand	Estonia	26.16	1	1
15	Christine Magnuson	United States	26.21	2	2
16	Daniela Samulski	Germany	26.33	1	8	NR

Rank	Name	Nationality	Time	Lane	Notes
	Marieke Guehrer	Australia	25.48	6	OC
	Yafei Zhou	China	25.57	2	AS
	Ingvild Snildal	Norway	25.58	3
4	Therese Alshammar	Sweden	25.59	4
5	Marleen Veldhuis	Netherlands	25.63	5
6	Sarah Sjöström	Sweden	25.66	7
7	Diane Bui Duyet	France	25.92	8
8	Daynara de Paula	Brazil	26.12	1

• Heats Results
• Semifinals Results
• Final Results