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.

Itching is a metalcore/melodic death metal band from Cologne, Germany, formed in 2020, blending the breakdowns and aggression of metalcore with melodic death metal's harmonic richness. The band delivers emotionally charged extremity from the Rhine metropolis.

Ithilien is a folk metal/metalcore band from Brussels, Belgium, formed in 2011, coining the term "FolkCore" to describe their fusion of traditional Belgian folk instruments — Flemish bagpipes, hurdy gurdy, whistles, bouzouki — with metalcore and death metal. Influenced by Parkway Drive and Architects alongside folk traditions, their album From Ashes to the Frozen Land (2013) showcases this unique cross-pollination.

Metalcore band from Mänttä-Vilppula in the Pirkanmaa region, formed in 2019. Their sound delivers metalcore from the central Finnish interior.

Ivory is a deathcore and metalcore outfit from Fürstenfeld, Austria, formed in 2019, channeling crushing breakdowns and aggressive riffing. The band fuses the rhythmic brutality of deathcore with melodic metalcore hooks in a punishing modern extreme metal style.