Athletics at the 2011 Pan American Games – Women's 400 metres
The women's 400 metres sprint competition of the athletics events at the 2011 Pan American Games will take place between the 24 and 26 of October at the Telmex Athletics Stadium. The defending Pan American Games champion is Ana Guevara of Mexico, who has since retired.
Records
Prior to this competition, the existing world and Pan American Games records were as follows:| World record | 47.60 | Canberra, Australia | 6 October 1985 | |
| Pan American Games record | 49.61 | Havana, Cuba | August 5, 1991 |
Qualification
Each National Olympic Committee was able to enter up to two entrants providing they had met the minimum standard in the qualifying period.Schedule
Results
All times shown are in seconds.| KEY: | q | Fastest non-qualifiers | Q | Qualified | NR | National record | PB | Personal best | SB | Seasonal best |
Semifinals
The semifinals were held on October 25. The top three in each heat and the next two fastest qualified for the final.| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 2 | Jennifer Padilla | 51.76 | Q | |
| 2 | 2 | Daisurami Bonne | 52.20 | Q | |
| 3 | 2 | Patricia Hall | 52.47 | Q | |
| 4 | 2 | Geisa Coutinho | 52.56 | q | |
| 5 | 1 | Norma González | 52.67 | Q | |
| 6 | 1 | Aymée Martínez | 52.76 | Q | |
| 7 | 1 | Joelma Sousa | 52.96 | Q | |
| 8 | 1 | Raysa Sánchez | 53.08 | q | |
| 9 | 1 | Nallely Vela | 53.29 | ||
| 10 | 1 | Christian Brennan | 53.34 | ||
| 11 | 1 | Leslie Cole | 53.38 | ||
| 12 | 2 | Kineke Alexander | 53.42 | SB | |
| 13 | 2 | Jessica Cousins | 54.38 | ||
| 14 | 2 | Kanika Beckles | 56.43 |
Final
The final was held on October 26.| Rank | Name | Nationality | Time | Notes |
| Jennifer Padilla | 51.53 | PB | ||
| Daisurami Bonne | 51.69 | PB | ||
| Geisa Coutinho | 51.87 | |||
| 4 | Aymée Martínez | 52.09 | ||
| 5 | Norma González | 52.18 | ||
| 6 | Joelma Sousa | 52.34 | ||
| 7 | Patricia Hall | 52.69 | ||
| 8 | Raysa Sánchez | 52.86 |