Inntrance is a heavy/groove metal band from Madrid, Spain, active since 2011, blending traditional heavy metal power with the rhythmic crunch of groove metal. Over a decade, the band has built a hypnotic, trance-inducing approach to heavy music from the Spanish capital.

Inopexia is a heavy metal band from Vedra, Spain, active since 2009, delivering classic heavy metal from the rural Galician countryside. Over fifteen years, the band has forged their sound from the green, rain-drenched landscapes of northwestern Spain.

Madrid-based act formed in 2011, evolving from early nu-metal origins into a heavier metal and hard rock direction. Their stylistic evolution reflects a maturation from alternative-leaning metal toward more traditional heaviness.

InPhaze is a heavy metal/hard rock band from Athens, Greece, active since 2025 and forging classic heavy metal with conviction and power. The project channels the timeless spirit of traditional metal riffage.

Inpoisonous is a heavy/thrash metal band from Athens, Greece, active since 2023 and delivering aggressive, riff-driven thrash with relentless intensity. The project channels the speed and fury of the genre.

Inquisitor is a heavy metal/hard rock band from the Kladno/Unhost area of the Czech Republic, active since 2006, delivering riff-driven traditional metal rooted in the genre's classic era. The band channels the industrial heritage of the Kladno steel-working region into hard-hitting heavy metal.

Thrash/heavy metal band from the Ortuella/Muzkiz area in Basque Country, active since 2012. Their provocative name and thrash/heavy metal approach channel aggression from the industrial Bilbao suburbs.

Insane Asylum are a heavy metal band from Manchester, formed in 2018. They deliver classic heavy metal from the northwest of England.

Insanehead is a thrash/heavy metal band from Rocca Priora (Rome), Italy, active since 2025 and delivering aggressive, riff-driven thrash with relentless intensity. The project channels the speed and fury of the genre.