2018 IAAF World U20 Championships – Women's 400 metres

Qualification: First 4 of each heat (Q) and the 4 fastest times (q) qualified for the semifinals.[2]

Rank	Heat	Name	Nationality	Time	Note
1	4	Hima Das	India	52.25	Q
2	1	Taylor Manson	United States	52.68	Q
3	4	Stacey-Ann Williams	Jamaica	52.71	Q, SB
4	2	Mary Moraa	Kenya	52.85	Q, PB
5	3	Ella Connolly	Australia	52.99	Q, SB
6	2	Andrea Miklós	Romania	53.14	Q
7	3	Tiffani Silva	Brazil	53.18	Q
8	3	Roxana Gómez	Cuba	53.19	Q
9	1	Davicia Patterson	Ireland	53.20	Q
10	2	Elisabetta Vandi	Italy	53.51	Q, PB
11	1	Stella Wonruku	Uganda	53.55	Q
12	2	Frehiywot Wondie	Ethiopia	53.59	Q
13	1	Sharelle Samuel	Canada	53.62	Q, PB
14	4	Ashlan Best	Canada	53.91	Q SB
15	4	Fiordaliza Cofil	Dominican Republic	54.13	Q
16	5	Jisna Mathew	India	54.32	Q
17	1	Nuo Liang	China	54.33	q SB
18	2	Giovana Rosalia dos Santos	Brazil	54.35	q
19	5	Amanda Crawford	Grenada	54.37	Q
20	1	Angie Melisa Palacios	Colombia	54.42	q, PB
21	3	Shalysa Wray	Cayman Islands	54.48	Q
22	4	Yu Zhou	China	54.49	q, SB
23	4	Martina Weil	Chile	54.52
24	3	Camilla Pitzalis	Italy	54.59	PB
25	2	Ciara Deely	Ireland	54.69
26	5	Veronica Vancardo	Switzerland	54.93	Q
27	5	Laura Kaufmann	Germany	54.96	Q
28	2	Mette Baas	Finland	55.42
29	3	Milagros Durán	Dominican Republic	55.56
30	5	Symone Mason	United States	55.66
31	5	Mahilet Fikre	Ethiopia	55.88
32	4	Tetyana Kaysen	Ukraine	57.14
33	3	Nicola Gibbon	South Africa	57.90
34	5	Maria Alejandra Carmona	Nicaragua	58.39	PB
35	1	Marlie Viljoen	South Africa	59.01
36	1	Aishath Himna Hassan	Maldives	59.76	NJR
37	5	Patricija Karlina Roshofa	Latvia	1:00.08
	3	Rae-Anne Serville	Trinidad and Tobago	DNF
	2	Pamela Milano	Venezuela	DNS

Qualification: First 2 of each heat (Q) and the 2 fastest times (q) qualified for the final.[3]

Rank	Heat	Name	Nationality	Time	Note
1	1	Hima Das	India	52.10	Q
2	1	Andrea Miklós	Romania	52.48	Q
3	3	Ella Connolly	Australia	52.78	Q, SB
4	3	Mary Moraa	Kenya	52.98	Q
5	1	Stacey-Ann Williams	Jamaica	53.00	q
6	2	Taylor Manson	United States	53.00	Q
7	2	Ashlan Best	Canada	53.24	Q, PB
8	1	Elisabetta Vandi	Italy	53.24	q, NJR
9	2	Roxana Gómez	Cuba	53.26
10	2	Tiffani Silva	Brazil	53.30
11	3	Davicia Patterson	Ireland	53.57
12	1	Sharelle Samuel	Canada	53.68
13	2	Jisna Mathew	India	53.86
14	2	Fiordaliza Cofil	Dominican Republic	53.94
15	1	Yu Zhou	China	54.00	SB
16	3	Frehiywot Wondie	Ethiopia	54.14
17	3	Giovana Rosalia dos Santos	Brazil	54.30
18	1	Shalysa Wray	Cayman Islands	54.32
19	1	Stella Wonruku	Uganda	54.32
20	3	Amanda Crawford	Grenada	54.36
21	2	Laura Kaufmann	Germany	54.91
22	3	Veronica Vancardo	Switzerland	55.13
23	3	Nuo Liang	China	55.51
	2	Angie Melisa Palacios	Colombia	DNS

[4]

Rank	Lane	Name	Nationality	Time	Note
	4	Hima Das	India	51.46
	3	Andrea Miklós	Romania	52.07	PB
	6	Taylor Manson	United States	52.28
4	5	Ella Connolly	Australia	52.82
5	7	Mary Moraa	Kenya	52.94
6	1	Stacey-Ann Williams	Jamaica	53.23
7	2	Elisabetta Vandi	Italy	53.40
8	8	Ashlan Best	Canada	53.59