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The women's 200 m butterfly at the 2009 World Championships took place on 29 July (heats and semifinals) and on the evening of 30 July (finals) at the Foro Italico in Rome, Italy.

Records

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

World record	Liu Zige (CHN)	2:04.18	Beijing, China	14 August 2008
Championship record	Otylia Jędrzejczak (POL)	2:05.61	Montreal, Canada	28 July 2005

The following records were established during the competition:

Date	Round	Name	Nationality	Time	Record
29 July	Heat 4	Mary DeScenza	United States	2:04.14	WR
30 July	Final	Jessicah Schipper	Australia	2:03.41	WR

Results

Heats

Rank	Name	Nationality	Time	Heat	Lane	Notes
1	Mary DeScenza	United States	2:04.14	4	3	WR
2	Jessicah Schipper	Australia	2:05.50	4	4
3	Katinka Hosszú	Hungary	2:06.21	6	6	NR
4	Samantha Hamill	Australia	2:06.32	4	6
5	Annika Mehlhorn	Germany	2:06.45	5	1	NR
6	Aurore Mongel	France	2:06.66	5	5
7	Audrey Lacroix	Canada	2:06.67	5	2	NR
8	Jiao Liuyang	China	2:07.01	5	4
9	Yui Miyamoto	Japan	2:07.13	5	6
10	Ellen Gandy	Great Britain	2:07.33	6	4
11	Kathleen Hersey	United States	2:07.34	6	3
12	Liu Zige	China	2:07.55	5	3
13	Caterina Giacchetti	Italy	2:07.84	6	5
14	Micha Kathrine Østergaard Jensen	Denmark	2:08.54	6	2
15	Magali Rousseau	France	2:08.57	6	7
16	Zsuzsanna Jakabos	Hungary	2:08.63	1	8
17	Mirela Olczak	Poland	2:08.72	6	0
18	Tanya Hunks	Canada	2:09.42	4	8
19	Francesca Segat	Italy	2:09.54	4	7
20	Joanna Maranhão	Brazil	2:09.55	4	1	SA
21	Yana Martynova	Russia	2:09.80	4	0
22	Petra Granlund	Sweden	2:09.87	5	7
23	Rita Medrano	Mexico	2:10.29	5	9	NR
24	Jessica Dickons	Great Britain	2:10.32	4	2
25	Martina van Berkel	Switzerland	2:11.41	5	0
26	Mireia Belmonte García	Spain	2:11.55	4	5
27	Martina Granström	Sweden	2:11.65	6	8
28	Katheryn Meaklim	South Africa	2:11.75	6	1
29	Yang Chin-Kuei	Chinese Taipei	2:12.90	3	4
30	Gráinne Murphy	Ireland	2:13.66	3	3
31	Emilia Pikkarainen	Finland	2:13.77	4	9
32	Tetyana Khala	Ukraine	2:13.98	6	9
33	Yumisleisy Morales Mendoza	Cuba	2:14.00	3	7	NR
34	Paula Zukowska	Poland	2:14.09	3	5
35	Barbora Závadová	Czech Republic	2:14.83	3	8
36	Lynette Lim	Singapore	2:15.82	2	2
37	Nina Dittrich	Austria	2:15.95	5	8
38	Erica Cirila Totten	Philippines	2:16.13	3	9
39	Yasemin Rosenberger	Turkey	2:16.24	3	2
40	Kristina Bernice Lennox	Puerto Rico	2:17.56	3	1
41	Maida Turnadzic	Bosnia and Herzegovina	2:18.09	3	6
42	Eliana Barrios	Venezuela	2:18.14	3	0
43	Simona Muccioli	San Marino	2:19.84	2	4
44	Ting Sheng-Yo	Chinese Taipei	2:21.05	1	4
45	Koh Ting Ting	Singapore	2:21.31	2	5
46	Maria Coy	Guatemala	2:21.37	2	3
47	Laura lucia Paz Chavez	Honduras	2:21.47	2	9
48	Aiste Dobrovolskaite	Lithuania	2:22.48	2	0
49	Karrakchou Lilia	Morocco	2:23.32	2	8
50	Davina Mangion	Malta	2:24.39	1	6
51	Vandita Dhariyal	India	2:25.07	1	2
52	Pooja Raghava Alva	India	2:25.08	1	3
53	Ana Euceda Gutierrez	Honduras	2:25.51	1	5
54	Ramond Sherazad	Morocco	2:26.69	2	1
55	Daniela Reyes Hinrichsen	Chile	2:27.49	2	7
56	Miniruwani Samarakoon	Sri Lanka	2:39.21	1	7
57	Tieri Erasito	Fiji	2:45.20	1	1

Semifinals

Rank	Name	Nationality	Time	Heat	Lane	Notes
1	Katinka Hosszú	Hungary	2:04.27	2	5	ER
2	Mary DeScenza	United States	2:04.33	2	4
3	Jessicah Schipper	Australia	2:04.87	1	4	OC
4	Jiao Liuyang	China	2:04.96	1	6
5	Aurore Mongel	France	2:05.09	1	3	NR
6	Liu Zige	China	2:05.29	1	7
7	Samantha Hamill	Australia	2:05.99	1	5
8	Audrey Lacroix	Canada	2:06.85	2	6
9	Kathleen Hersey	United States	2:06.89	2	7
10	Annika Mehlhorn	Germany	2:07.43	2	3
11	Micha Kathrine Østergaard Jensen	Denmark	2:07.44	1	1	NR
12	Caterina Giacchetti	Italy	2:07.59	2	1
13	Yui Miyamoto	Japan	2:08.13	2	2
14	Zsuzsanna Jakabos	Hungary	2:08.34	1	8
15	Ellen Gandy	Great Britain	2:08.55	1	2
16	Magali Rousseau	France	2:08.94	2	8

Finals

Rank	Name	Nationality	Time	Lane	Notes
	Jessicah Schipper	Australia	2:03.41	3	WR
	Liu Zige	China	2:03.90	7	AS
	Katinka Hosszú	Hungary	2:04.28	4
4	Mary Descenza	United States	2:04.41	5
5	Jiao Liuyang	China	2:04.50	6
6	Aurore Mongel	France	2:05.48	2
7	Audrey Lacroix	Canada	2:05.95	8	NR
8	Samantha Hamill	Australia	2:06.11	1