Kaatayra is the one-man atmospheric folk black metal project of Brasília-based musician Caio Lemos, launched in 2019. Lemos weaves traditional Brazilian folk instrumentation and regional mythology into raw black metal frameworks, drawing its name from a word meaning "Son or Daughter of The Woods." The project proved immediately prolific, releasing two full-lengths in its debut year — No Ruidar da Mata que Mirra and Nascido Sob o Signo Incivilizatório — and followed with further albums including Só Quem Viu o Relâmpago à Sua Direita Sabe (2020) and Inpariquipê (2021).

Kalte Seetürme is a black metal and ambient project from São Paulo, Brazil, formed in 2024. The project has released three recordings — Kristallhallen, Nachtweg, and Blasser Glanz — all available on Bandcamp, with German-language titles pointing toward a Nordic-influenced aesthetic within the Brazilian underground scene.

Kamaq is a black metal band from Lima, Peru, formed in 2021, whose name draws from Andean cosmology — "Kamaq" refers to the animating force or creator spirit in Quechua tradition. The band released their debut full-length "Los que vinieron antes" in 2024, channeling themes of nature and earth cult through their black metal sound.

Kanvass is a black metal duo from Santo André, São Paulo, consisting of Ammonoch (guitars, bass, vocals) and drummer Morbus. The band released their debut EP The Southern Thunder Roars in 2014 and have since recorded several albums including Downfall of Individuality and Generation of Deserters (2023), the latter released through Hammer of Damnation. Their sound draws deliberate comparisons to the stripped-down Norwegian orthodoxy of Gorgoroth, Tsjuder, and Urgehal.

Kaosharmony is an extreme metal band from Hortolândia, São Paulo, founded by Jeff, who handles songwriting and the band's creative direction. The project draws from European death metal influences and centers its lyrics on the historical confrontation between indigenous peoples and colonizers, with releases We Stand To Battle and Battlefields available on Bandcamp.

Karçaz is a solo black metal project from Belo Horizonte, Minas Gerais, created by Lucas Damaso under the pseudonym Profanus Damasus at the end of 2023. The name is derived from the Portuguese word "carcaça" (carcass), and the project spans black metal, black/death, and atmospheric styles across numerous self-released recordings including Hávamál, Aeternum Tormentum, and Codex Regius, all made available on streaming platforms in 2024.

Kasbeel is a black metal band from Temuco, Chile, signed to Australis Records, whose name is drawn from the fallen angel Kasbeel described in the Book of Enoch — the guardian who rebelled against God after witnessing his self-crowning. Their 2015 full-length Rebellion and Opposition, recorded at Acusti-k Studios in Temuco, delivers raw and violent black metal with satanic and anti-Christian themes, drawing comparisons to Darkthrone and Marduk.

Katarsis Tenebris was a raw black metal band from Ponta Grossa, Paraná, Brazil, active from 2017 until splitting up around 2020. The band released the demo Cursed Plains of Mortality in May 2018, followed by the three-track demo Black KVLT in March 2019, exploring themes of darkness, occultism, and depression. Both recordings were self-released as digital albums under the banner of Brazilian raw black metal.

Key of Salomon is a Brazilian black metal band whose discography includes the demos Summoning of the Night Spirits (1998) and Illecebrarum Infernalis (1999), both self-released. The band operated in the raw, underground tradition of Brazilian black metal and has since split up.