Nodrāztie Zīmuļi is a sludge/stoner metal band from Riga, Latvia, formed in 2022. Their Latvian name adds local character to their heavy, groove-laden sound.

Noiserip is a sludge/stoner/doom metal act from Ylöjärvi, Finland, delivering crushing, extended compositions that merge the suffocating weight of doom with grinding sludge and stoner grooves. Their self-titled 2020 release channels raw, unfiltered heaviness across two sprawling tracks.

Nomadic Rituals is a sludge/doom metal band from Belfast, Northern Ireland, active since 2012. The band delivers crushing sludge and doom metal from the Northern Irish capital.

Nomasta is a sludge metal band from Leeds, UK, active since 2017. The band channels heavy, grinding sludge metal from West Yorkshire.

NoNoYesNo is a Munich-based band that evolved from hardcore punk roots into industrial and sludge metal since 2011. The project's contradictory name reflects their shape-shifting approach to heavy music.

Nonperson is a sludge/doom metal band from Glasgow, Scotland, formed in 2020. Their sound delivers the oppressive weight of sludge and doom metal from the west of Scotland.

Lviv drone/doom/sludge metal act formed in 2012, crafting immersive, slowly evolving sonic landscapes through the fusion of multiple heavy genres. Their patient, meditative approach to extreme heaviness rewards devoted listening.

Noorag is a groove/progressive/sludge metal band from Cagliari, Sardinia, formed in 2023. They layer heavy grooves with progressive complexity from the Sardinian capital.

Noosed is a death/sludge metal band from Galway, Ireland, active since 2019. They tighten the noose with crushing, suffocating heaviness from the west of Ireland.