2004 World Junior Championships in Athletics – Women's 400 metres

15 July

Rank	Name	Nationality	Time	Notes
	Natasha Hastings	United States	52.04
	Sonita Sutherland	Jamaica	52.41
	Ashlee Kidd	United States	52.45
4	Tang Xiaoyin	China	52.87
5	Olga Soldatova	Russia	52.99
6	Asami Tanno	Japan	53.34
7	Annemarie Schulte	Netherlands	53.67
8	Liliya Pilyuhina	Ukraine	53.82

14 July

Rank	Name	Nationality	Time	Notes
1	Olga Soldatova	Russia	53.56	Q
2	Tang Xiaoyin	China	53.61	Q
3	Annemarie Schulte	Netherlands	53.93	Q
4	Sonita Sutherland	Jamaica	54.19	Q
5	Muna Jabir Adam	Sudan	54.49
6	Amanda Kotze	South Africa	56.08
7	Kineke Alexander	Saint Vincent and the Grenadines	56.42
8	Abigail David	Trinidad and Tobago	65.15

Rank	Name	Nationality	Time	Notes
1	Natasha Hastings	United States	53.50	Q
2	Asami Tanno	Japan	53.83	Q
3	Ashlee Kidd	United States	53.93	Q
4	Liliya Pilyuhina	Ukraine	54.04	Q
5	Anja Pollmächer	Germany	54.24
6	Jaimee-Lee Hoebergen	Australia	54.59
7	Özge Gürler	Turkey	55.50
8	Monique Williams	New Zealand	56.13

13 July

Rank	Name	Nationality	Time	Notes
1	Natasha Hastings	United States	52.61	Q
2	Asami Tanno	Japan	53.37	Q
3	Jaimee-Lee Hoebergen	Australia	53.48	Q
4	Amanda Kotze	South Africa	54.32	q
5	Antonina Krivoshapka	Russia	55.05
6	Pınar Saka	Turkey	55.50
7	Angela Makaha	Zimbabwe	55.88
8	Wu Shanshan	China	56.31

Rank	Name	Nationality	Time	Notes
1	Ashlee Kidd	United States	53.56	Q
2	Annemarie Schulte	Netherlands	53.67	Q
3	Kineke Alexander	Saint Vincent and the Grenadines	54.00	Q
4	Emma Björkman	Sweden	54.41
5	Gabriela Medina	Mexico	55.95
6	Maria Spacca	Italy	56.50
7	Mounira Al-Saleh	Syria	57.10

Rank	Name	Nationality	Time	Notes
1	Sonita Sutherland	Jamaica	53.52	Q
2	Liliya Pilyuhina	Ukraine	54.05	Q
3	Monique Williams	New Zealand	54.85	Q
4	Maris Mägi	Estonia	54.93
5	Carline Muir	Canada	55.15
6	Jacqueline Davies	Australia	55.76

Rank	Name	Nationality	Time	Notes
1	Abigail David	Trinidad and Tobago	53.48	Q
2	Olga Soldatova	Russia	53.54	Q
3	Tang Xiaoyin	China	53.74	Q
4	Anja Pollmächer	Germany	53.78	q
5	Muna Jabir Adam	Sudan	54.25	q
6	Özge Gürler	Turkey	54.41	q
7	Gemma Nicol	United Kingdom	54.77
8	Liga Zauna	Latvia	58.21

According to an unofficial count, 29 athletes from 24 countries participated in the event.