The Men's 800 metres event at the 2006 IAAF World Indoor Championships was held on 10–12 March 2006.
The winning margin was 0.01 seconds which as of July 2024 remains the only time the men's 800 metres has been won by less than 0.02 seconds at these championships.
| width=200 bgcolor=gold | Gold | width=200 bgcolor=silver | Silver | width=200 bgcolor=CC9966 | Bronze |
| Wilfred Bungei | Mbulaeni Mulaudzi | Yuriy Borzakovskiy |
First 2 of each heat (Q) and the next 2 fastest (q) qualified for the semifinals.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 2 | 1:47.19 | Q | |||
| 2 | 2 | 1:47.36 | Q, SB | |||
| 3 | 2 | 1:47.58 | q, SB | |||
| 4 | 2 | 1:47.74 | q, NR | |||
| 5 | 4 | 1:47.88 | Q, SB | |||
| 6 | 4 | 1:47.95 | Q | |||
| 7 | 1 | 1:48.08 | Q | |||
| 8 | 1 | 1:48.20 | Q, PB | |||
| 9 | 4 | 1:48.30 | ||||
| 10 | 4 | 1:48.33 | ||||
| 11 | 5 | 1:48.73 | Q | |||
| 12 | 5 | 1:48.79 | Q | |||
| 13 | 5 | 1:48.84 | ||||
| 14 | 5 | 1:48.97 | ||||
| 15 | 3 | 1:49.03 | Q, SB | |||
| 16 | 3 | 1:49.09 | Q | |||
| 17 | 3 | 1:49.15 | ||||
| 18 | 1 | 1:49.21 | ||||
| 19 | 1 | 1:49.49 | ||||
| 20 | 3 | 1:49.61 | ||||
| 21 | 1 | 1:49.84 | ||||
| 22 | 2 | 1:50.65 | NR | |||
| 23 | 3 | 1:51.07 | ||||
| 24 | 5 | 1:51.67 | SB | |||
| 25 | 4 | 1:59.25 |
First 3 of each semifinal qualified directly (Q) for the final.
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 1 | 1:46.82 | Q, SB | |||
| 2 | 2 | 1:46.90 | Q | |||
| 3 | 1 | 1:47.09 | Q | |||
| 4 | 2 | 1:47.23 | Q | |||
| 5 | 2 | 1:47.23 | Q, PB | |||
| 6 | 1 | 1:47.38 | Q, PB | |||
| 7 | 2 | 1:47.50 | ||||
| 8 | 1 | 1:47.55 | ||||
| 9 | 2 | 1:47.68 | ||||
| 10 | 1 | 1:47.87 | ||||
| 11 | 1 | 1:48.30 | ||||
| 12 | 2 | 1:52.75 |
| Rank | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|
| 1:47.15 | |||||
| 1:47.16 | |||||
| 1:47.38 | |||||
| 4 | 1:48.01 | ||||
| 5 | 1:48.44 | ||||
| 6 | 1:48.56 |