Inversion are a progressive death metal and deathcore band from London, formed in 2023. They blend progressive death metal technicality with the crushing weight of deathcore.

Inversion of Control is a melodic/progressive death metal band from Darmstadt, Germany, active since 2016, blending Gothenburg-influenced melodies with progressive compositional ambition. The band channels the university city's intellectual energy into technically demanding, hook-laden extreme metal.

Power/thrash/progressive metal band from Helsinki, Finland formed in 2024. Their multi-genre approach delivers ambitious metal from the Finnish capital.

Inward Path is a progressive metal band from Lviv, Ukraine, active since 2025 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.

Io is a progressive heavy metal band from Leuven, Belgium, formed in 2023, weaving intricate compositional structures through heavy, dynamic arrangements. The band explores ambitious, genre-defying territory where technical musicianship meets expansive songwriting.

Ioannis Anastassakis is a progressive metal/rock/fusion band from Athens/Maroussi, Greece, active since 2004 and crafting ambitious, technically proficient compositions that push beyond conventional metal boundaries. The project channels progressive sophistication.

Iona Death Cult is a progressive sludge metal band from Bray, Ireland, active since 2017 and delivering crushing, suffocating heaviness from the low end. The project channels the abrasive, punishing weight of sludge metal.

Iotunn is a progressive metal band from Copenhagen, Denmark, active since 2016, evolving from progressive power metal toward progressive melodic death metal. The band's name — the Norse word for "giant" — reflects their ambitious, larger-than-life approach to heavy music.

Ipomonia is a progressive metal band from Soborg, Denmark, formed in 2025, exploring complex musical territory from the greater Copenhagen area. The band represents the newest generation of Danish progressive metal.