| Diabolic Symphony | |
| Type: | Album |
| Artist: | Steel Attack |
| Cover: | Steel_Attack_Diabolic_Symphony.png |
| Released: | April 21, 2006 |
| Recorded: | Black Lounge Studios, Sweden |
| Genre: | Power metal |
| Length: | 52:02 |
| Label: | Massacre Records in Europe Locomotive Records in USA |
| Producer: | Jonas Kjellgren Steel Attack |
| Prev Title: | Enslaved |
| Prev Year: | 2004 |
| Next Title: | Carpe DiEnd |
| Next Year: | 2008 |
Diabolic Symphony is the fifth album by the Swedish power metal band Steel Attack.