400m Men U20 Semi Final, Heat:1 of 2 ; Official result since 10:33
| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
| 1 | 4 | 1857 | Ebrahim Husen | Terunsh Dibaba | 46.88 | Q | |||
| 2 | 6 | 1526 | ADEM MUSA | CBE | 47.71 | Q | |||
| 3 | 5 | 1527 | DEMESS DESALEGNE | CBE | 48.16 | Q | |||
| 4 | 2 | 1525 | LUWAK WEI | CBE | 48.31 | q | |||
| 5 | 8 | 2400 | TESFAYE BEDADA | SHEGER | 48.65 | ||||
| 6 | 3 | 1063 | Sinitayehu Tadesse | Ethio Electeric | 48.84 | ||||
| 7 | 7 | 1579 | SAMUEL GETAHUN | ECSC | 48.90 | ||||
| 8 | 1 | 1247 | LUTHI OCHALLA | Mechal | 50.35 |
