| Event: | Men's 400 metre freestyle S9 |
| Games: | 2020 Summer |
| Venue: | Tokyo Aquatics Centre |
| Dates: | 25 August 2021 |
| Competitors: | 13 |
| Nations: | 9 |
| Gold: | William Martin |
| Goldnpc: | AUS |
| Silver: | Ugo Didier |
| Silvernpc: | FRA |
| Bronzenpc: | AUS |
The Men's 400 metre freestyle S9 event at the 2020 Paralympic Games took place on 25 August 2021, at the Tokyo Aquatics Centre.
The swimmers with the top 8 times, regardless of heat, advanced to the final.[1]
| Rank | Heat | Lane | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|---|
| 1 | 2 | 5 | 4:14.26 | ||||
| 2 | 2 | 4 | 4:15.23 | ||||
| 3 | 1 | 3 | 4:17.95 | ||||
| 4 | 1 | 6 | 4:17.99 | ||||
| 5 | 1 | 4 | 4:19.30 | ||||
| 6 | 1 | 5 | 4:20.28 | ||||
| 7 | 2 | 3 | 4:25.33 | ||||
| 8 | 2 | 6 | 4:26.13 | ||||
| 9 | 2 | 7 | 4:27.11 | ||||
| 10 | 2 | 2 | 4:27.96 | ||||
| 11 | 1 | 2 | 4:28.70 | ||||
| 12 | 2 | 1 | 4:30.34 | ||||
| 13 | 1 | 7 | 4:33.76 |
| Rank | Lane | Name | Nationality | Time | Notes | +400m freestyle final |
|---|---|---|---|---|---|---|
| 6 | 4:10.25 | PR | ||||
| 5 | 4:11.33 | |||||
| 4 | 4:13.54 | |||||
| 4 | 2 | 4:14.48 | ||||
| 5 | 7 | 4:17.41 | ||||
| 6 | 3 | 4:22.40 | ||||
| 7 | 1 | 4:24.75 | ||||
| 8 |