# 2023 Asian Athletics Championships – Men's 400 metres

The men's 400 metres event at the 2023 Asian Athletics Championships was held on 12 and 13 July.

## Medalists

| Gold | Silver | Bronze |
| Kentaro Sato Japan | Fuga Sato Japan | Youssef Masrahi Saudi Arabia |

## Results
### Heats

Held on 12 July
Qualification rule: First 3 in each heat (Q) and the next 4 fastest (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 2 | Fuga Sato | Japan | 45.97 | Q |
| 2 | 3 | Muhammad Ajmal | India | 46.06 | Q |
| 3 | 3 | Kentaro Sato | Japan | 46.08 | Q |
| 4 | 1 | Ashraf Hussen Osman | Qatar | 46.22 | Q |
| 5 | 2 | Ammar Ismail Yahya Ibrahim | Qatar | 46.27 | Q |
| 6 | 1 | Youssef Masrahi | Saudi Arabia | 46.34 | Q |
| 7 | 4 | Rajesh Ramesh | India | 46.45 | Q |
| 8 | 1 | Rajitha Niranjan Rajakaruna | Sri Lanka | 46.52 | Q |
| 9 | 4 | Aruna Darshana | Sri Lanka | 46.56 | Q |
| 10 | 3 | Umar Osman | Malaysia | 46.72 | Q |
| 11 | 2 | Joshua Atkinson | Thailand | 46.74 | Q |
| 12 | 2 | Frederick Ramirez | Philippines | 46.77 | q |
| 13 | 4 | Mikhail Litvin | Kazakhstan | 46.86 | Q |
| 14 | 2 | Yefim Tarassov | Kazakhstan | 47.27 | q |
| 15 | 2 | Hamza Abdullah Al-Jabri | Oman | 47.49 | q |
| 16 | 4 | Kim Ui-Yeon | South Korea | 47.52 | q |
| 17 | 3 | Sarawut Nuansri | Thailand | 47.55 | |
| 18 | 1 | Umajesty Williams | Philippines | 47.55 | |
| 19 | 3 | Rajan Thiruben Thana | Singapore | 47.69 | |
| 20 | 4 | Trần Đình Sơn | Vietnam | 47.85 | |
| 21 | 4 | Zubin Percy Muncherji | Singapore | 47.97 | |
| 22 | 1 | Mueed Abdul | Pakistan | 48.18 | |
| 23 | 3 | Kumal Som Bahadur | Nepal | 48.33 | PB |
| 24 | 1 | Nguyễn Tùng Lâm | Vietnam | 48.59 | |
| 25 | 4 | Mohamad Mortada | Lebanon | 48.62 | |
| 26 | 2 | Dilshodbek Boboqulov | Uzbekistan | 48.80 | |
| 27 | 3 | Adam Riffath | Maldives | 50.67 | PB |
| 28 | 4 | Abdul Rasheed Ismail | Maldives | 50.72 | PB |
| | 1 | Lucky Yooyamadu | Thailand | DQ | |

### Semifinals

Held on 12 July Qualification rule: First 3 in each heat (Q) and the next 2 fastest (q) qualified for the final.
| Rank | Heat | Name | Nationality | Time | Notes |
| 1 | 1 | Fuga Sato | Japan | 45.61 | Q |
| 2 | 2 | Kentaro Sato | Japan | 45.64 | Q |
| 3 | 2 | Youssef Masrahi | Saudi Arabia | 45.66 | Q |
| 4 | 2 | Ashraf Hussen Osman | Qatar | 45.66 | Q |
| 5 | 2 | Muhammad Ajmal | India | 45.76 | q |
| 6 | 1 | Aruna Darshana | Sri Lanka | 45.79 | Q |
| 7 | 1 | Rajesh Ramesh | India | 45.91 | Q |
| 8 | 2 | Rajitha Niranjan Rajakaruna | Sri Lanka | 46.12 | q, PB |
| 9 | 1 | Umar Osman | Malaysia | 46.42 | |
| 10 | 2 | Joshua Atkinson | Thailand | 46.43 | |
| 11 | 1 | Frederick Ramirez | Philippines | 46.53 | PB |
| 12 | 1 | Mikhail Litvin | Kazakhstan | 46.74 | |
| 13 | 2 | Yefim Tarassov | Kazakhstan | 47.04 | |
| 14 | 2 | Hamza Abdullah Al-Jabri | Oman | 47.45 | |
| 15 | 1 | Kim Ui-yeon | South Korea | 47.58 | |
| | 1 | Ammar Ismail Yahya Ibrahim | Qatar | DNF | |

### Final

Held on 13 July
| Rank | Lane | Name | Nationality | Time | Notes |
| | 6 | Kentaro Sato | Japan | 45.00 | PB |
| | 5 | Fuga Sato | Japan | 45.13 | PB |
| | 4 | Youssef Masrahi | Saudi Arabia | 45.19 | SB |
| 4 | 1 | Muhammad Ajmal | India | 45.36 | PB |
| 5 | 7 | Ashraf Hussen Osman | Qatar | 45.61 | |
| 6 | 8 | Rajesh Ramesh | India | 45.67 | PB |
| 7 | 3 | Aruna Darshana | Sri Lanka | 45.69 | |
| 8 | 2 | Rajitha Niranjan Rajakaruna | Sri Lanka | 46.60 | |