Noala carves out an extreme corner of the sludge and post-metal world by fusing the wall-of-sound density of Neurosis with industrial texture reminiscent of Nine Inch Nails at full volume, resulting in a sound that is both corrosive and hypnotic. Their 2013 debut "Humo" runs across seven tracks and an hour of material, with compositions stretching past fifteen minutes and building through alternating layers of crushing riffs, harsh vocals, and quieter atmospheric passages.

Noctem Aeternus is a solo atmospheric black metal project founded in 2015 in Córdoba, Argentina, built around a single multi-instrumentalist who composes and records all material independently. The project released its debut full-length, Winter Spells, in December 2017, followed by Landscape of Discord in 2019 via German label Naturmacht Productions, and the EP My Spectre Around Me Night and Day in 2021, the latter drawing its lyrics from William Blake poetry.

Nocthun describes their music as "apocalyptic antifascist metal," channeling blackened death metal into explicitly political and confrontational themes. Their debut full-length "Rest in Flames" establishes the project with tracks like "In the Uncanny Valley of Death" and "Volcanic Hellfire," pairing blast-driven aggression with ideological conviction.

Nocturn Decadence is a black metal project from Osorno, Los Lagos, active since 2016, blending raw black metal with blackgaze and dark ambient textures around themes of loneliness, nature, and existential contempt. The band self-released two albums independently: Impavida Muerte in March 2017 and Sirviente del Psicodelico Lenguaje Inconexo in 2018.

Nocturnal Bleed play old-school death metal with a raw, unpolished ferocity rooted in the Floridan and Swedish traditions, releasing the debut full-length Lake of Fire in 2024 — a ten-track assault spanning short blasts like "Morbid Whisper" through to lumbering cuts like "Planetary Slavery" and "Devour the Corpse." The record was preceded by the 2023 single "Scourge of Pain," establishing the band's place in the Pará underground.

Nocturnal Delirium is a raw black metal act from Isla de Maipo, Santiago, originally operating as Delirio Nocturno from 2007 before adopting the current name. The band is signed to Ukrainian underground label Depressive Illusions Records, through which it released the demo Abyss I and the split album Memories with Askaroth in 2016, with lyrical themes centered on darkness, paganism, loneliness, and hate.

Nocturnal Desecration is a two-piece blackened death metal band from Posadas, Misiones, Argentina, consisting of Demonspeed on guitars and vocals and Érebo on drums. Their debut release, Liberation Through Death, a six-track EP recorded at Away From the Light Studio in Posadas, was released on December 2, 2022, issued on pro CD through Ablaze Productions (Mexico) and on cassette through Metal Squad Records (Argentina).

Nocturnal Fog are a two-piece raw black thrash outfit built around Oldskull on vocals, guitar, and bass, and drummer Deathhammer, debuting with the 2014 EP Manifestation of the Essence before delivering the 2017 cassette Nocturnal Ritual — five tracks of speed-driven riffing and barked vocals recorded with characteristic lo-fi grit. The band also contributed to a 2015 tribute to Quorthon, signaling the direct first-wave Bathory influence that runs through their sound.

Nocturnal Force channel early blackened thrash with an occult edge across three releases — A Touch of Evil (2016), Invocation of Morbid Power (2017), and The Kingdom of Hatred (2023) — the last a seven-track self-release featuring songs like "Forças de Satã (Guerras Profanas)" and "Cryptic Invocation." The band is primarily the work of Nahemoth on vocals, drums, and guitars, with Kellaborn contributing bass.