The men's 400 metres at the 2010 IAAF World Indoor Championships will be held at the ASPIRE Dome on 12 and 13 March.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Chris Brown | William Collazo | Jamaal Torrance |
| Standing records prior to the 2010 IAAF World Indoor Championships | |||||
|---|---|---|---|---|---|
| World record | 44.57 | Fayetteville, United States | 12 March 2005 | ||
| Championship record | 45.26 | Toronto, Canada | 14 March 1993 | ||
| World Leading | 45.03 | Fayetteville, United States | 12 February 2010 | ||
| African record | 45.51 | Paris, France | 9 March 1997 | ||
| Asian record | 45.76 | Paris, France | 9 March 1997 | ||
| European record | 45.05 | Sindelfingen, West Germany | 5 February 1988 | ||
| North and Central American and Caribbean record | 44.57 | Fayetteville, United States | 12 March 2005 | ||
| Oceanian Record | 45.93 | Birmingham, Great Britain | 2 March 2003 | ||
| South American record | 46.26 | Boston, United States | 29 January 2005 | ||
| Date | Time | Round | |
|---|---|---|---|
| March 12, 2010 | 9:35 | Heats | |
| March 12, 2010 | 19:30 | Semifinals | |
| March 13, 2010 | 18:05 | Final |
Qualification: First 2 in each heat (Q) and the next 2 fastest (q) advance to the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 4 | 46.70 | Q | |||
| 2 | 2 | 46.72 | Q | |||
| 3 | 2 | 46.78 | Q | |||
| 4 | 4 | 46.80 | Q | |||
| 5 | 3 | 46.87 | Q | |||
| 6 | 3 | 46.94 | Q | |||
| 7 | 5 | 46.95 | Q | |||
| 8 | 3 | 47.02 | q | |||
| 9 | 1 | 47.03 | Q | |||
| 10 | 2 | 47.06 | q | |||
| 11 | 1 | 47.10 | Q | |||
| 5 | Q, Doping | |||||
| 12 | 1 | 47.21 | ||||
| 13 | 5 | 47.23 | ||||
| 14 | 1 | 47.26 | ||||
| 15 | 4 | 47.26 | ||||
| 16 | 5 | 47.28 | ||||
| 17 | 3 | 47.39 | ||||
| 18 | 1 | 48.21 | NR | |||
| 19 | 2 | 48.26 | ||||
| 20 | 4 | 48.28 | ||||
| 21 | 4 | 48.37 | ||||
| 22 | 3 | 48.85 | ||||
| 23 | 5 | 49.09 | SB | |||
| 24 | 2 | 49.92 | NR | |||
| 25 | 3 | 50.96 | SB | |||
| 26 | 4 | 55.33 | SB | |||
| 1 | ||||||
| 5 |
Qualification: First 3 in each heat (Q) qualified. to the final.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 46.13 | Q | |||
| 2 | 1 | 46.15 | Q | |||
| 3 | 1 | 46.34 | Q, PB | |||
| 4 | 2 | 46.64 | Q | |||
| 5 | 2 | 46.69 | Q | |||
| 6 | 2 | 46.73 | Q, SB | |||
| 7 | 1 | 46.84 | ||||
| 8 | 2 | 46.95 | ||||
| 9 | 1 | 47.09 | ||||
| 1 | Doping | |||||
| 10 | 2 | 47.70 | ||||
| 11 | 2 | 48.02 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 45.96 | SB | ||||
| 46.31 | PB | ||||
| 46.43 | |||||
| 4 | 46.55 | SB | |||
| 5 | 46.84 | ||||