Insidiator Morbi is a black metal project from Athens, Greece, active since 2024 and forging dark, aggressive extremity within the Greece black metal scene. The project channels the unrelenting intensity of the genre.

Insidious are an industrial death metal band from Nottingham, England, formed in 2022. They fuse industrial textures with death metal heaviness.

Insidious Disease is a Norwegian death metal supergroup formed in Oslo in 2004, drawing membership from the ranks of Dimmu Borgir, Morgoth, Napalm Death, and Nile. Vocalist Marc Grewe and bassist Shane Embury anchor a lineup devoted to classic, unadorned death metal, and the band is signed to Nuclear Blast Records.

Insidious One is a speed/thrash/death metal band from Moscow, Russia, active since 2015 and merging death metal's heaviness with thrash's relentless velocity. The project delivers aggressive crossover fury.

Insidious Process is a black/sludge metal/crust punk act from Gothenburg, Sweden, active since 2009 and fusing black metal aggression with punk-influenced rawness and energy. The project bridges extreme metal and underground punk traditions.

Brutal death metal band from Spain launched in 2025. Their sound pushes into the genre's most punishing territory.

Insidious Voice is a progressive metal band from Hanover, Germany, formed in 2018, weaving intricate compositions through dynamic, technically demanding arrangements. The band explores the ambitious outer reaches of heavy metal from Lower Saxony's capital.

Insidious Void are a three-piece blackened death metal band from Belfast, Northern Ireland, formed in 2022. Their discography spans from their debut album Entropy through the 2024 Hellscape EP, delivering ferocious blackened death metal.

Symphonic death metal band from Madrid, Spain formed in 2019, layering orchestral grandeur over death metal aggression from the Spanish capital.