2019 Asian Athletics Championships – Men's 400 metres
The men's 400 metres at the 2019 Asian Athletics Championships was held on 21 and 22 April.
Medalists
Results
Heats
Qualification rule: First 3 in each heat and the next 4 fastest qualified for the semifinals.| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 3 | Julian Jrummi Walsh | 46.00 | Q | |
| 2 | 4 | Arokia Rajiv | 46.25 | Q | |
| 3 | 1 | Taha Hussein Yassen | 46.27 | Q, NR | |
| 4 | 1 | Abbas Abubakar Abbas | 46.27 | Q | |
| 5 | 1 | Muhammed Anas Yahiya | 46.36 | Q | |
| 6 | 1 | Ashraf Hussein Osman | 46.54 | q, PB | |
| 7 | 4 | Rikuya Ito | 46.59 | Q, SB | |
| 8 | 2 | Mikhail Litvin | 46.72 | Q | |
| 9 | 2 | Mehboob Ali | 46.96 | Q | |
| 10 | 3 | Mo Il-hwan | 47.01 | Q | |
| 11 | 2 | Mohamed Nasir Abbas | 47.05 | Q | |
| 12 | 2 | Yasir Ali Al-Saadi | 47.15 | q | |
| 13 | 2 | Phitchaya Sunthonthuam | 47.31 | q | |
| 13 | 3 | Ajith Premakumara Millagaha Gedara | 47.31 | Q | |
| 15 | 2 | Xu Haoran | 47.40 | q, SB | |
| 16 | 4 | Yousef Karam | 47.47 | Q | |
| 17 | 3 | Pan Haitao | 47.69 | SB | |
| 18 | 1 | Andrey Sokolov | 47.93 | ||
| 18 | 4 | Joyme Sequita | 47.93 | ||
| 20 | 4 | Grigoriy Derepaskin | 47.94 | SB | |
| 21 | 3 | Mazen Mawtan Al-Yasen | 48.24 | ||
| 22 | 4 | Ahmed Al-Yaari | 48.27 | NR | |
| 23 | 1 | Mohammad Jahir Rayhan | 48.51 | ||
| 23 | 2 | Kirill Sarasov | 48.51 | ||
| 25 | 3 | Tan Zongyang | 49.09 | ||
| 26 | 1 | Saeed Bahashwan | 49.72 | ||
| 27 | 4 | Skhakhzatbek Sadykzhanuulu | 49.95 | PB | |
| 3 | Hassan Mansour |
Semifinals
Qualification rule: First 3 in each heat and the next 2 fastest qualified for the final.| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 1 | Yousef Karam | 45.04 | Q, PB | |
| 2 | 1 | Abbas Abubakar Abbas | 45.27 | Q, SB | |
| 3 | 1 | Mikhail Litvin | 45.38 | Q, NR | |
| 4 | 1 | Julian Jrummi Walsh | 45.67 | q | |
| 5 | 2 | Arokia Rajiv | 45.96 | Q | |
| 6 | 2 | Taha Hussein Yassen | 46.04 | Q, NR | |
| 7 | 1 | Muhammed Anas Yahiya | 46.10 | q | |
| 8 | 1 | Mo Il-hwan | 46.17 | PB | |
| 9 | 2 | Rikuya Ito | 46.52 | Q, SB | |
| 10 | 1 | Ashraf Hussein Osman | 46.85 | ||
| 11 | 1 | Yasir Ali Al-Saadi | 47.01 | ||
| 12 | 2 | Ajith Premakumara Millagaha Gedara | 47.07 | ||
| 13 | 2 | Mohamed Nasir Abbas | 47.10 | ||
| 14 | 2 | Phitchaya Sunthonthuam | 47.15 | ||
| 15 | 2 | Xu Haoran | 47.23 | SB | |
| 16 | 2 | Mehboob Ali | 47.61 |