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Medalists

Gold	Abdalelah Haroun Qatar
Silver	Wilbert London III United States
Bronze	Karabo Sibanda Botswana

Standing records prior to the 2016 IAAF World U20 Championships in Athletics
World Junior Record	Steve Lewis (USA)	43.87	Seoul, South Korea	28 September 1988
Championship Record	Hamdan Odha Al-Bishi (KSA)	44.66	Santiago, Chile	20 October 2000
World Junior Leading	Baboloki Thebe (BOT)	44.22	Gaborone, Botswana	21 May 2016

Qualification: First 3 of each heat (Q) and the 6 fastest times (q) qualified for the semifinals.^[1]

Rank	Heat	Name	Nationality	Time	Note
1	1	Geoffrey Kiprotich Rono	Kenya	46.23	Q, PB
2	3	Baboloki Thebe	Botswana	46.25	Q
3	6	Karabo Sibanda	Botswana	46.34	Q
4	5	Kahmari Montgomery	United States	46.46	Q
5	4	Abdalelah Haroun	Qatar	46.51	Q
6	2	Christopher Taylor	Jamaica	46.73	Q
7	5	Myles Banfield	Canada	46.77	Q, PB
8	2	Kazuki Matsukiyo	Japan	46.78	Q
9	6	Jamal Walton	Cayman Islands	46.83	Q
10	4	Sean Bailey	Jamaica	46.83	Q
11	4	Cameron Chalmers	Great Britain	46.91	Q
12	6	Iván Núñez	Mexico	46.96	Q
13	3	Luis Charles	Dominican Republic	47.09	Q
14	6	Edwin Ngeeti	Kenya	47.11	q
15	2	Anthony Zambrano	Colombia	47.18	Q
16	2	Tymoteusz Zimny	Poland	47.20	q
17	1	Wilbert London III	United States	47.23	Q
18	2	Taha Hussein Yaseen	Iraq	47.31	q
19	3	Naoki Kitadani	Japan	47.32	Q
20	1	Moussa Ali Issa	Bahrain	47.39	Q
21	6	Vladimir Aceti	Italy	47.62	q
22	5	Wu Yuang	China	47.65	Q
23	2	Jochem Dobber	Netherlands	47.67	q
24	6	David Šalamon	Croatia	47.79	q
25	1	Mo Il-hwan	South Korea	47.82
26	4	Nathan Friginette	Canada	47.91
27	3	Brayan Lopez	Italy	47.92
28	1	Mihai Cristian Pislaru	Romania	48.01
29	5	Derrick Mokaleng	South Africa	48.04
30	4	Henri Delauze	Bahamas	48.15
31	5	Lawson Power	Australia	48.36
32	6	Joshua St. Clair	Trinidad and Tobago	48.39
33	5	Charles Devantay	Switzerland	48.42
34	3	Kinard Rolle	Bahamas	48.60
35	6	Andile Lusenga	Swaziland	48.67
36	2	Vitsanu Phosri	Thailand	49.30	SB
37	1	Gezahegn Ababu	Ethiopia	49.54
38	4	Kashief King	Trinidad and Tobago	50.06
39	2	Alessandro Gasperoni	San Marino	50.48
	3	Dawid Kapała	Poland	DNF
	1	Samson Oghenewegba Nathaniel	Nigeria	DNS
	3	Gemechu Alemu	Ethiopia	DNS
	4	Ojo Sunday Fatoyinbo	Nigeria	DNS
	5	Abdallah Djimet Souleyman	Saudi Arabia	DNS

Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.^[2]

Rank	Heat	Name	Nationality	Time	Note
1	1	Karabo Sibanda	Botswana	45.15	Q
2	3	Geoffrey Kiprotich Rono	Kenya	45.38	Q
3	3	Wilbert London III	United States	45.49	Q
4	2	Abdalelah Haroun	Qatar	45.55	Q
5	1	Kahmari Montgomery	United States	45.71	Q
6	1	Anthony Zambrano	Colombia	45.81	q, PB
7	1	Naoki Kitadani	Japan	46.41	q, PB
8	3	Cameron Chalmers	Great Britain	46.51
9	3	Christopher Taylor	Jamaica	46.60
10	1	Jamal Walton	Cayman Islands	46.61
11	2	Kazuki Matsukiyo	Japan	46.69	Q
12	3	Wu Yuang	China	46.83
13	2	Iván Núñez	Mexico	47.00
14	1	Sean Bailey	Jamaica	47.09
15	3	Tymoteusz Zimny	Poland	47.14	PB
16	2	Jochem Dobber	Netherlands	47.22
17	1	Taha Hussein Yaseen	Iraq	47.26
18	2	Luis Charles	Dominican Republic	47.33
19	1	Vladimir Aceti	Italy	47.41
20	3	Myles Banfield	Canada	47.46
21	2	Edwin Ngeeti	Kenya	47.51
22	3	David Šalamon	Croatia	47.51	PB
	2	Baboloki Thebe	Botswana	DQ	R163.3(a)^[3]
	2	Moussa Ali Issa	Bahrain	DNS

Rank	Lane	Name	Nationality	Time	Note
	6	Abdalelah Haroun	Qatar	44.81	SB
	7	Wilbert London III	United States	45.27	PB
	5	Karabo Sibanda	Botswana	45.45
4	4	Geoffrey Kiprotich Rono	Kenya	45.64
5	8	Kahmari Montgomery	United States	46.48
6	2	Anthony Zambrano	Colombia	46.50
7	9	Kazuki Matsukiyo	Japan	46.69	PB
8	3	Naoki Kitadani	Japan	47.15