Athletics at the 2008 Summer Olympics - Women's 400 metres

Qualification: First 3 in each heat (Q) and the next 3 fastest (q) advance to the Semifinals.

Rank	Heat	Time	Notes
1	5	50.54	Q
2	7	50.57	Q
3	7	50.59	Q
4	2	50.87	Q, NR
5	2	50.91	Q
6	5	50.99	Q, SB
7	1	51.00	Q
7	4	51.00	Q
9	4	51.18	Q
10	1	51.25	Q, SB
11	3	51.32	Q
12	1	51.39	Q, PB
13	1	51.41	q
14	5	51.45	Q
15	3	51.46	Q
16	6	51.52	Q
17	2	51.55	Q, PB
18	2	51.56	q
19	7	50.62	Q
20	6	51.81	Q
21	3	51.87	Q
22	4	51.96	Q
23	7	51.97	q
24	2	52.24	SB
25	4	52.38
26	7	52.40
27	1	52.41
28	5	52.60
29	5	52.69
30	6	52.77	Q
31	7	52.80
32	6	52.87
33	2	52.88
33	6	52.88
35	3	53.06
36	3	53.08
37	1	53.22
38	4	53.26
39	4	53.32
40	5	53.36
41	3	53.94
42	5	53.99
43	6	54.11
44	2	54.15
45	7	54.16
46	6	54.84
47	6	58.14
48	7	59.91
49	3		NR
50	4

Qualification: First 2 in each heat (Q) and the next 2 fastest {q} advance to the Final.

Rank	Heat	Time	Notes
1	2	49.90	Q
2	1	50.14	Q, SB
3	1	50.28	Q, SB
4	2	50.30	Q, PB
5	1	50.31	q
6	3	50.48	Q
7	3	50.54	Q
8	3	50.63	q
9	3	50.71	SB
10	3	50.83	NR
11	1	50.93	=NR
12	2	51.06
13	1	51.13
14	3	51.30
15	2	51.51
16	1	51.80
17	2	51.87
17	3	51.87
19	2	52.11
20	2	52.37
21	1	52.45
22	2	52.67
23	1	52.97
24	3	54.18

Rank	Lane	Time	Notes
	4	49.62	SB
	6	49.69	PB
	7	49.93
4	5	50.01	PB
5	9	50.03	PB
6	3	50.11	SB
7	2	50.68
8	8	51.18

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