Athletics at the 1999 Pan American Games – Women's 400 metres

The women's 400 metres event at the 1999 Pan American Games was held July 24–25.

Medalists

Gold	Silver	Bronze
Ana Guevara Mexico	Michelle Collins United States	Claudine Williams Jamaica

Results

Heats

Qualification: First 2 of each heat (Q) and the next 2 fastest (q) qualified for the final.

Rank	Heat	Name	Nationality	Time	Notes
1	2	Ana Guevara	Mexico	51.23	Q
2	3	Michelle Collins	United States	51.42	Q
3	2	Claudine Williams	Jamaica	51.88	Q
4	2	Aliann Pompey	Guyana	52.65	q
5	3	Norfalia Carabalí	Colombia	52.73	Q
6	1	Andrea Anderson	United States	52.83	Q
7	2	Foy Williams	Canada	52.95	q
7	3	Tonique Williams	Bahamas	52.95
9	1	Melissa Straker	Barbados	52.96	Q
10	3	Verneta Lesforis	Saint Lucia	53.07
11	3	Idalmis Bonne	Cuba	53.09
12	1	LaDonna Antoine	Canada	53.10
13	3	Zoila Stewart	Costa Rica	55.37
	1	Tracey Barnes	Jamaica	DNS
	2	Hazel-Ann Regis	Grenada	DNS

Final

Rank	Name	Nationality	Time	Notes
	Ana Guevara	Mexico	50.91
	Michelle Collins	United States	51.21
	Claudine Williams	Jamaica	51.58
4	Andrea Anderson	United States	52.43
5	Melissa Straker	Barbados	52.90
6	Norfalia Carabalí	Colombia	53.06
7	Foy Williams	Canada	53.65
	Aliann Pompey	Guyana	DNF