The men's 800 metres event at the 2005 Asian Athletics Championships was held in Incheon, South Korea on September 2–4.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Majed Saeed Sultan | Abdulrahman Suleiman | Sajjad Moradi |
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 1:48.08 | Q | |||
| 2 | 3 | 1:48.61 | Q | |||
| 3 | 3 | 1:48.71 | Q | |||
| 4 | 3 | 1:48.75 | q | |||
| 5 | 1 | 1:49.52 | Q | |||
| 6 | 3 | 1:49.86 | q | |||
| 7 | 2 | 1:50.50 | Q | |||
| 8 | 2 | 1:50.68 | Q | |||
| 9 | 1 | 1:50.74 | SB | |||
| 10 | 1 | 1:50.88 | ||||
| 11 | 1 | 1:51.43 | ||||
| 12 | 3 | 1:51.58 | SB | |||
| 13 | 2 | 1:51.63 | ||||
| 14 | 3 | 1:51.95 | PB | |||
| 15 | 1 | 1:52.88 | ||||
| 16 | 2 | 1:53.38 | ||||
| 17 | 2 | 1:53.47 | ||||
| 18 | 3 | 1:53.77 | ||||
| 19 | 1 | 1:55.51 | ||||
| 20 | 1 | 1:57.76 | ||||
| 2 | ||||||
| 2 | ||||||
| 3 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 1:44.27 | AJR, NR | ||||
| 1:44.73 | PB | ||||
| 1:44.74 | NR | ||||
| 4 | 1:45.78 | ||||
| 5 | 1:46.67 | SB | |||
| 6 | 1:47.09 | NR | |||
| 7 | 1:49.45 | ||||
| 8 | 1:51.19 |