| Underwater Nightmare | |
| Type: | EP |
| Artist: | O'Death |
| Cover: | Underwater Nightmare.jpg |
| Recorded: | Kemado Studios |
| Length: | 11:54 |
| Label: | Kemado Records |
| Producer: | Tobias Levin |
| Prev Title: | Broken Hymns, Limbs and Skin |
| Prev Year: | 2008 |
| Next Title: | Outside |
| Next Year: | 2011 |
Underwater Nightmare is a vinyl 7"/digital EP by gothic country band O'Death.