Necron King is a death/sludge metal band from Espoo, active since 2019. The band fuses death metal with sludge heaviness from the Helsinki metropolitan area.

Necrorgasm is a drone/sludge metal project from Wiesbaden in Hessen, active since 2008. The project plumbs the lowest frequencies of drone and sludge from the spa city on the Rhine.

Nedgeva is a French power trio from Colmar delivering high-energy rock and metal with no concessions, drawing on hard rock, blues rock, and punk influences. Their 2016 debut Lost Signal captures five tracks of raw, unfiltered heavy rock energy.

Negative Concept is a Parisian doom/sludge metal band formed in 2015 by Cédric M., delivering a genre-spanning sound they describe as doom sludge grunge through black metal with blues sources. Their 2022 debut Unwelcome explores the darkness and complexity of the human soul across ten tracks of crushing, disillusioned heaviness.

Zagreb doom and sludge metal outfit formed in 2015, delivering oppressive sonic weight and slow-burning heaviness from Croatia's capital. Their crushing approach channels the most suffocating impulses of both genres.

Neila is a sludge metal and post-hardcore band from Santurtzi in the Basque Country, active since 2002. Over two decades of sludge-soaked post-hardcore from the Bilbao estuary make them a veteran of the Basque heavy music scene.

Nekkral is a French black/doom/sludge metal and ambient project formed in 2015, blending the oppressive weight of doom and sludge with black metal darkness and ambient textures. The project explores the intersection of extreme metal heaviness and atmospheric soundscaping.

Nekyia Orchestra is a sludge and post-metal band from Berlin, active since 2013. The band crafts expansive, orchestral-tinged sludge and post-metal from the German capital.

Nephtys is a stoner and sludge metal band from La Louviere in Belgium's Hainaut province, formed in 2025. Named after the Egyptian goddess of mourning, the project brings low-tuned, heavy riffing to Wallonia's nascent sludge scene.