| Event: | Men's 3000 metres |
| Competition: | 2021 World Athletics U20 Championships |
| Venue: | Kasarani Stadium |
| Dates: | 18 August |
| Competitors: | 16 |
| Nations: | 12 |
| Win Label: | Winning time |
| Win Value: | 7:42.09 |
| Gold: | Tadese Worku |
| Goldnoc: | ETH |
| Silver: | Ali Abdilmana |
| Silvernoc: | ETH |
| Bronze: | Habtom Samuel |
| Bronzenoc: | ERI |
| Next: | 2022 |
The men's 3000 metres at the 2021 World Athletics U20 Championships was held at the Kasarani Stadium on 18 August.[1]
| Standing records prior to the 2021 World Athletics U20 Championships | |||||
|---|---|---|---|---|---|
| World U20 Record | 7:28.19 | Paris, France | 27 August 2016 | ||
| Championship Record | New event | ||||
| World U20 Leading | 7:34.75 | Székesfehérvár, Hungary | 6 July 2021 | ||
The final was held on 18 August at 17:50.[2]
| Rank | Name | Nationality | Time | Note | |||
|---|---|---|---|---|---|---|---|
| align=left | align=left |  | 7:42.09 | CR | |||
| align=left | align=left | | 7:44.55 | ||||
| align=left | align=left |  | 7:52.69 | ||||
| 4 | align=left | align=left | | 7:55.50 | |||
| 5 | align=left | align=left |  | 8:04.07 | |||
| 6 | align=left | align=left |  | 8:08.76 | |||
| 7 | align=left | align=left |  | 8:09.40 | |||
| 8 | align=left | align=left | | 8:09.98 | |||
| 9 | align=left | align=left | | 8:12.96 | |||
| 10 | align=left | align=left |  | 8:27.59 | |||
| 11 | align=left | align=left | 8:30.76 | ||||
| 12 | align=left | align=left |  | 8:52.01 | |||
| 13 | align=left | align=left | 9:10.10 | ||||
| 14 | align=left | align=left | 9:15.27 | ||||
| align=left | align=left |  | |||||
| align=left | align=left |