2000 World Junior Championships in Athletics
Track events
100 m	men	women
200 m	men	women
400 m	men	women
800 m	men	women
1500 m	men	women
3000 m		women
5000 m	men	women
10,000 m	men
100 m hurdles		women
110 m hurdles	men
400 m hurdles	men	women
3000 m steeplechase	men
4 × 100 m relay	men	women
4 × 400 m relay	men	women
10,000 m walk	men	women
Field events
High jump	men	women
Pole vault	men	women
Long jump	men	women
Triple jump	men	women
Shot put	men	women
Discus throw	men	women
Hammer throw	men	women
Javelin throw	men	women
Combined events
Heptathlon		women
Decathlon	men
v t e

The men's 400 metres event at the 2000 World Junior Championships in Athletics was held in Santiago, Chile, at Estadio Nacional Julio Martínez Prádanos on 17, 18 and 20 October.^[1][2]

Gold	Hamdan Al-Bishi  Saudi Arabia
Silver	Brandon Simpson  Jamaica
Bronze	Shinji Ishikawa  Japan

20 October

Rank	Name	Nationality	Time	Notes
	Hamdan Al-Bishi	Saudi Arabia	44.66
	Brandon Simpson	Jamaica	45.73
	Shinji Ishikawa	Japan	45.77
4	Damion Barry	Trinidad and Tobago	45.86
5	William Hernández	Venezuela	45.94
6	Richard Sharp	South Africa	45.97
7	Jonathan Palma	Venezuela	46.36
8	Rafał Wieruszewski	Poland	46.37

18 October

Rank	Name	Nationality	Time	Notes
1	Damion Barry	Trinidad and Tobago	46.63	Q
2	Rafał Wieruszewski	Poland	46.66	Q
3	Shinji Ishikawa	Japan	46.99	Q
4	Jonathan Palma	Venezuela	47.10	Q
5	Tshepo Thobelangope	South Africa	47.18
6	Gordon Kennedy	Ireland	47.37
7	Bastian Swillims	Germany	47.43
8	Vladimir Demchenko	Ukraine	47.54

Rank	Name	Nationality	Time	Notes
1	Hamdan Al-Bishi	Saudi Arabia	45.69	Q
2	Brandon Simpson	Jamaica	45.96	Q
3	William Hernández	Venezuela	46.77	Q
4	Richard Sharp	South Africa	46.83	Q
5	Sherridan Kirk	Trinidad and Tobago	47.08
6	Shinji Itabashi	Japan	47.67
7	Bruno Ediarimalala	Madagascar	47.91
8	James Graham	United States	49.64

17 October

Rank	Name	Nationality	Time	Notes
1	Hamdan Al-Bishi	Saudi Arabia	46.63	Q
2	Gordon Kennedy	Ireland	46.94	Q
3	Jonathan Palma	Venezuela	47.27	q
4	Mark Ormrod	Australia	47.66
5	Richard Petzold	Germany	48.96
6	David Neilsen	Guam	49.99
7	Melville Rogers	Saint Kitts and Nevis	51.18

Rank	Name	Nationality	Time	Notes
1	Brandon Simpson	Jamaica	46.64	Q
2	Bastian Swillims	Germany	47.06	Q
3	David Melo	Spain	47.96
4	Marcelo Figueroa	El Salvador	47.99
5	Alexis Roberts	Bahamas	49.02
6	Liu Yuan-Kai	Chinese Taipei	49.06
	Japheth Ogamba	Kenya	DQ	IAAF rule 163.3

Rank	Name	Nationality	Time	Notes
1	Damion Barry	Trinidad and Tobago	46.62	Q
2	Tshepo Thobelangope	South Africa	46.81	Q
3	Bruno Ediarimalala	Madagascar	46.83	q
4	Urel Lacroix	France	47.34
5	Dmitriy Petrov	Russia	47.66
6	Jesús Torres	Puerto Rico	48.58
7	Khalid Brooks	Anguilla	53.09
	Sándor Gombos	Hungary	DQ	IAAF rule 163.3

Rank	Name	Nationality	Time	Notes
1	William Hernández	Venezuela	46.52	Q
2	Rafał Wieruszewski	Poland	46.64	Q
3	Vladimir Demchenko	Ukraine	47.10	q
4	Cameron Brown	Australia	47.36
5	Florin Suciu	Romania	47.44
6	Nathan Justin	Saint Lucia	49.66
7	Shane Ogumoro	Northern Mariana Islands	56.72

Rank	Name	Nationality	Time	Notes
1	Shinji Itabashi	Japan	47.37	Q
2	James Graham	United States	48.06	Q
3	Sebastián Martínez	Chile	48.21
4	Sam Higgie	New Zealand	48.31
5	David Hamil	Cayman Islands	49.97
6	Lucien Kramar	Guinea	52.94

Rank	Name	Nationality	Time	Notes
1	Shinji Ishikawa	Japan	46.53	Q
2	Richard Sharp	South Africa	46.84	Q
3	Sherridan Kirk	Trinidad and Tobago	47.06	q
4	Abdellatif El-Ghazaoui	Morocco	48.35
5	Hamed Al-Bishi	Saudi Arabia	48.40
6	Elton Spain	United States	50.03
7	Ku King Kit	Hong Kong	51.92

According to an unofficial count, 42 athletes from 34 countries participated in the event.