NoWrong deliver punishing thrash metal with a blunt fixation on politics, social inequality, and modern urban violence, channeling those themes across the 13 tracks of their 2014 debut Prognostic of a Great Disaster. The record leans heavily on classic Bay Area and Teutonic influences, keeping the riffs fast and the production raw without losing coherence.

Nox is a black metal band from Valparaíso, Chile, formed in 2008, operating in the tradition of raw, underground South American black metal. The band has released material independently, exploring themes of darkness and occultism through a stripped-back, atmospheric approach to the genre. Nox represents part of a broader resurgence of extreme black metal activity within the Chilean underground scene in the 2010s.

Nox Eterna have been refining their brand of classic heavy metal since the mid-1990s, with a sound that balances crunching riffs against melodic, hard-rock-tinged choruses built for the stage. Their catalog spans multiple decades and includes the albums Mind Abduction (2009) and The Ocean Is Mine (2014), and in 2007 the band was selected among the top fifty acts from a national pool of 300 to represent Brazil at Wacken Open Air.

NoxEternum is a black/death metal band from Alto Paraná, Paraguay, active from 2022 until their split-up. In their brief existence they were prolific, releasing two full-length albums — "Portal to NoxEternum" and "The Black Window of the Mind" — along with two singles, all in 2022.

Nucflash is a thrash metal band from Buenos Aires, Argentina, that emerged from an earlier project called Warfare before settling on their current lineup and name. They released the EP Spreading the Virus in 2011 and The Purifying Fire in 2017, and shared the stage with German thrash veterans Kreator in 2013.

Nucleador came out of Sergipe playing uncompromising crossover thrash in the mold of the 1980s hardcore and thrash collision, recording their first EP within six months of forming despite none of the members having prior experience in the genre. They've built a steady catalog since, including the 2014 EP United by the Toxic and the 2021 full-length Back From the Dead, earning a spot at São Paulo's Night of Living Thrashers festival early in their career.

Nuclear is a Chilean thrash and death metal band formed in 2003 in Arica, drawing on the aggressive sonic tradition of Bay Area thrash while incorporating death metal brutality. The band released early albums Heaven Denied (2006) and Ten Broken Codes (2008) before signing to Candlelight Records for Formula for Anarchy, which expanded their reach internationally. Nuclear is recognized as one of the leading acts in the contemporary South American extreme metal scene.

Nuclear Brains blend black, thrash, and death metal in a deliberately lo-fi package, with the four-piece openly acknowledging on their 2015 EP First! that limited resources shaped the recording — funded through gig ticket sales and made with more energy than budget. The lineup of guitarists and vocalists Cão Westphalen and Rafael Decarli alongside bassist Ivan Borba and drummer Doug Hanauer gives the band a dual-vocal abrasiveness that suits the genre-crossing aggression.

Nuclear Screams traffic in a dense blend of death, thrash, speed, and melodic death metal that leans heavily on aggression without abandoning hooks. Their debut EP A Path to Endless Days arrived in November 2021, and the full-length Human Frailties followed in 2025, both recorded in Minas Gerais and showcasing a band comfortable moving between brutal riffing and more atmospheric passages.