Athletics at the 1920 Summer Olympics – Men's 400 metres hurdles
The men's 400 metres hurdles event was part of the track and field athletics programme at the 1920 Summer Olympics. The competition was held on Sunday, August 15, 1920, and on Monday, August 16, 1920. 19 runners from 9 nations competed.Records
These were the standing world and Olympic records prior to the 1920 Summer Olympics.
Frank Loomis set a new world record with 54.0 seconds in the final.Results
Quarterfinals
Quarterfinal 1
| Place | Athlete | Time | Qual. |
| 1 | | 57.6 | Q |
| 2 | | 58.4 | Q |
| 3 | | 58.8 | |
| 4 | | | |
Quarterfinal 2
| Place | Athlete | Time | Qual. |
| 1 | | 57.2 | Q |
| 2 | | 57.7 | Q |
| 3 | | 59.9 | |
| — | | DNF | |
| — | | DNF | |
Quarterfinal 3
| Place | Athlete | Time | Qual. |
| 1 | | 57.6 | Q |
| 2 | | 58.4 | Q |
| 3 | | 59.1 | |
| 4 | | | |
Quarterfinal 4
| Place | Athlete | Time | Qual. |
| 1 | | 56.4 | Q |
| 2 | | 56.7 | Q |
| 3 | | 57.9 | |
| — | | DNF | |
Quarterfinal 5
| Place | Athlete | Time | Qual. |
| 1 | | 55.8 | Q |
| 2 | | 55.9 | Q |
Semifinals
Semifinal 1
| Place | Athlete | Time | Qual. |
| 1 | | 55.4 | Q |
| 2 | | 55.5 | Q |
| 3 | | 56.2 | Q |
| 4 | | 56.5 | |
| 5 | | 56.9 | |
Semifinal 2
| Place | Athlete | Time | Qual. |
| 1 | | 55.4 | Q |
| 2 | | 55.7 | Q |
| 3 | | 55.8 | Q |
| 4 | | | |
| 5 | | | |
Final
The final was held on Monday, August 16, 1920.
| Place | Athlete | Time |
| 1 | | 54.0 WR |
| 2 | | 54.6 |
| 3 | | 54.7 |
| 4 | | 54.8 |
| 5 | | 55.4 |
| 6 | | 55.7 |
John Norton