Inzest are a death metal band from Innsbruck formed in 2004, operating in what they describe as "bulldozing deathcore" — extreme death metal infused with the blunt force of hardcore, drawing comparisons to Dying Fetus and Hatebreed. Their 2008 album Grotesque New World was released as a limited digipak on Mad Lion Records with bonus video content.

Iris are a melodic groove metal and metalcore band from England, formed in 2003. Their discography includes releases like Wrath and Radiant, blending melodic sensibility with heavy grooves.

Death metal/metalcore band from Aix-en-Provence in southern France, formed in 2020. Their sound fuses death metal with metalcore from the Provençal city.

Iron Altar are a progressive death metal and sludge band from Edinburgh, Scotland, established in 2016. Their 2023 album Promethean on Trepanation Recordings showcases their blend of progressive death metal with crushing sludge weight.

Blackened metalcore/noise rock band from Helsinki, Finland active since 2016. Their eclectic approach fuses blackened metal with metalcore and noise rock from the Finnish capital.

Iron Skies is a melodic death metal/metalcore band from Belfast, United Kingdom, active since 2016 and blending melodic harmonies with death metal aggression. The project channels the twin-guitar traditions of Scandinavian-influenced melodeath.

Ironside is a metalcore/hardcore act from Bradford, United Kingdom, active since 2009 and channeling monolithic heaviness through its doom metal framework. The project delivers oppressive, glacially paced compositions.

Isle of Man is a technical death metal/metalcore band from Eindhoven, Netherlands, active since 2012 and pushing death metal through precision-engineered technical complexity. The project channels intricate musicianship and compositional ambition.

Isor is a metalcore band from Rhyl, United Kingdom, active since 2019 and delivering aggressive, dynamic metal with crushing breakdowns and intense energy. The project channels the power of modern extreme metal.