ER season 12
| ER | |
|---|---|
| Season 12 | |
DVD cover | |
| Starring | |
| No. of episodes | 22 |
| Release | |
| Original network | NBC |
| Original release | September 22, 2005 – May 18, 2006 |
| Season chronology | |
The twelfth season of the American fictional drama television series ER first aired on September 22, 2005, and concluded on May 18, 2006. It consists of 22 episodes.