Invisible Hate is a doom metal act from Kragujevac, Serbia, active since 2020 and channeling monolithic heaviness through its doom metal framework. The project delivers oppressive, glacially paced compositions.

Invocation were a doom/death metal band from Trofaiach, Styria, formed in 1990 and active through the early part of that decade, releasing material on Napalm Records at a time when that label was first building its extreme metal catalog. The band dissolved in 1994, leaving behind a small body of work that captures Austria's nascent death-doom scene at its earliest formation.

Invouta is a sludge/doom metal band from Fribourg, Switzerland, formed in 2018, crafting heavy, slow-motion compositions in French. With releases including Ainsi-soit-il, L'appel de la corde, and Face à face, the band has been making metal for years and solidified their current formation in 2022.

Iommi are a doom/heavy metal band from Birmingham, England, formed in 2025. Named after the godfather of heavy metal's hometown, they carry forward Birmingham's rich doom metal tradition.

Iraventus is a melodic doom/death metal act from Saint Petersburg, Russia, active since 2017 and merging death metal's ferocity with doom's oppressive weight. The project inhabits the crushing intersection where both genres converge.

Irgalom is a black/death/doom metal act from Budapest, Hungary, active since 2018 and merging the atmospheric darkness of black metal with death metal's crushing brutality. The project delivers fierce extremity at the crossroads of both genres.

Iron Bra is a stoner/doom metal/grunge band from Oslo, Norway, active since 2021 and delivering crushing, fuzz-laden heaviness where doom's oppressive weight meets stoner metal's hazy grooves. The project channels low-end power and psychedelic atmosphere.

Iron Grave are an epic doom/death metal band from Northampton, England, formed in 2015. Their EP Conquering of the Draconthrope delivers massive battle doom with blackened and traditional elements, described as the sonic equivalent of DEFCON 0.

Epic heavy/doom metal band from Kuopio in eastern Finland, active since 2017. Their sword-and-sorcery name channels classic epic doom in the tradition of Cirith Ungol and Manilla Road.