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The men's 400 metres event at the 2023 Asian Athletics Championships was held on 12 and 13 July.^[1]

Medalists

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

Held on 12 July^[2]

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

Held on 12 July^[3]
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

Held on 13 July^[4]

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