| Event: | Women's 400 metres |
| Games: | 2023 |
| Venue: | Julio Martínez National Stadium |
| Dates: | October 30 – November 1 |
| Competitors: | 10 |
| Nations: | 8 |
| Win Value: | 51.48 |
| Win Label: | Winning time |
| Gold: | Martina Weil |
| Goldnoc: | CHI |
| Silver: | Nicole Caicedo |
| Silvernoc: | ECU |
| Bronze: | Evelis Aguilar |
| Bronzenoc: | COL |
| Prev: | 2019 |
| Next: | 2027 |
The men's 400 metres competition of the athletics events at the 2023 Pan American Games was held on October 30 and November 1 at the Julio Martínez National Stadium of Santiago, Chile.[1]
Prior to this competition, the existing world and Pan American Games records were as follows:
| World record | 47.60 | Canberra, Australia | October 6, 1985 | ||
| Pan American Games record | 49.61 | Havana, Cuba | August 6, 1991 |
| Date | Time | Round | |
|---|---|---|---|
| October 30, 2023 | 17:50 | Semifinal | |
| November 1, 2023 | 20:23 | Final |
All times shown are in seconds.
| KEY: | bgcolor=ccffcc align=center | q | bgcolor=ccffcc align=center | Q | Qualified | NR | National record | PB | Personal best | SB | Seasonal best | DQ | Disqualified |
Qualification: First 2 in each heat (Q) and next 2 fastest (q) qualified for the final. The results were as follows:[2]
| Rank | Heat | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 1 | 1 | 51.47 | Q | ||
| 2 | 1 | 51.82 | Q | ||
| 3 | 1 | 52.32 | Q | ||
| 4 | 1 | 52.70 | q | ||
| 5 | 1 | 52.83 | q, PB | ||
| 6 | 2 | 53.11 | Q | ||
| 7 | 2 | 53.64 | Q | ||
| 8 | 2 | 55.57 | Q | ||
| 2 | TR 16.8 | ||||
| 2 | |||||
The results were as follows:[3]
| Rank | Lane | Name | Nationality | Time | Notes |
|---|---|---|---|---|---|
| 6 | 51.48 | ||||
| 8 | 51.76 | ||||
| 5 | 51.95 | ||||
| 4 | 7 | 52.10 | |||
| 5 | 4 | 52.66 | |||
| 6 | 2 | 52.81 | PB | ||
| 7 | 3 | 53.59 | |||
| 1 | |||||