Diabula Rasa is a folk metal band from Lugo, in the Ravenna province of Emilia-Romagna, Italy, formed in 2005. Using bagpipes, electro-acoustic hurdy-gurdy, and pipe organ, the five-piece reimagines 13th and 14th century melodies with period-authentic lyrics fused into a modern metal and rock framework.

Diabulus in Musica is a symphonic/power metal band from Pamplona, Spain, active since 2012. They blend symphonic grandeur with power metal energy from Navarre.

Diachronia is a black and death metal band from Bielsko-Biala, Poland, formed in 2017. The project merges black metal's darkness with death metal's aggression from the Silesian Beskids.

Diaclast is a technical death metal band from Yekaterinburg, Russia, formed in 2014. The project delivers technically precise death metal from the Ural capital.

Diagnosis: Human is a progressive death/thrash metal band from Bern, active since 2013 and treating the human condition as a pathology to be dissected through complex, technically demanding compositions. Their clinical name frames their music as an examination of humanity's flaws through the scalpel of extreme metal.

Diagnosis:Different is a heavy metal band from the Viersen/Mönchengladbach/Düsseldorf area of Germany, active since 2012. They deliver heavy metal with a distinctive identity forged across the Rhineland.

Diagoras is a technical death metal band from Gothenburg, Sweden, formed in 2018. The project delivers technically precise death metal from the west coast.

Diaice is a Dutch black metal project formed in 2024, fusing the cold imagery of ice with the genre's atmospheric intensity. Their name suggests frozen, crystalline darkness — a fitting descriptor for the frigid hostility of their sound.

Diamatregon is a black metal band from Grenoble, France, active since 1997. With nearly three decades of activity, they are established pillars of the French Alpine black metal scene.