The men's 800 metres at the 2011 European Athletics U23 Championships were held at the Městský stadion on 14 and 15 July.
| Gold |  Adam KszczotPoland (POL) | |
| Silver |  Kevin LópezSpain (ESP) | |
| Bronze |  Mukhtar MohammedGreat Britain (GBR) |
| Date | Time | Round | |
|---|---|---|---|
| 14 July 2011 | 16:55 | Round 1 | |
| 15 July 2011 | 16:55 | Final |
Qualification: First 2 in each heat (Q) and 2 best performers (q) advance to the Final.[1]
| Rank | Heat | Name | Nationality | Time | Notes | |
|---|---|---|---|---|---|---|
| 1 | 2 | Kevin López | Spain | 1:47.43 | Q | |
| 2 | 2 | Jan van der Broeck |  Belgium | 1:47.78 | Q | |
| 3 | 2 | Anthony Lieghio |  Ireland | 1:48.06 | q, PB | |
| 4 | 3 | Mukhtar Mohammed | 1:48.20 | Q | ||
| 5 | 3 | Paul Renaudie |  France | 1:48.20 | Q | |
| 6 | 3 | Giordano Benedetti |  Italy | 1:48.34 | q | |
| 7 | 2 | Oleh Kayafa |  Ukraine | 1:48.46 | ||
| 8 | 3 | Brice Leroy | France | 1:48.70 | ||
| 9 | 2 | Patrick Schoenball |  Germany | 1:49.32 | ||
| 10 | 3 | Darren McBrearty | Ireland | 1:49.34 | ||
| 11 | 1 | Adam Kszczot | Poland | 1:49.43 | Q | |
| 12 | 1 | Mario Scapini | Italy | 1:49.58 | Q | |
| 13 | 1 | Martin Bischoff | Germany | 1:49.88 | ||
| 14 | 1 | Samir Dahmani | France | 1:49.95 | ||
| 15 | 1 | Artem Kazban | Ukraine | 1:50.87 | ||
| 16 | 1 | Francisco Roldán | Spain | 1:51.25 | ||
| 17 | 3 | Johan Svensson |  Sweden | 1:51.77 | ||
| 18 | 1 | Theofanis Michaelas |  Cyprus | 1:52.93 | ||
| 2 | Jan Kubista |  Czech Republic |
| Rank | Name | Nationality | React | Time | Notes | |
|---|---|---|---|---|---|---|
| Adam Kszczot | Poland | 1:46.71 | ||||
| Kevin López | Spain | 1:46.93 | ||||
| Mukhtar Mohammed | 1:48.01 | |||||
| 4 | Giordano Benedetti | Italy | 1:48.05 | SB | ||
| 5 | Mario Scapini | Italy | 1:48.43 | |||
| 6 | Anthony Lieghio | Ireland | 1:48.77 | |||
| 7 | Jan van der Broeck | Belgium | 1:49.41 | |||
| 8 | Paul Renaudie | France | 1:49.82 |
According to an unofficial count, 19 athletes from 12 countries participated in the event.