Kaiten is a thrash/death metal band from Valinhos, São Paulo, Brazil, formed in 2010. The band released the album Crash and Burn, operating as an unsigned independent act within the São Paulo underground metal scene.

Kampfwagen is a black/death metal band from Barranquilla, Colombia, formed in 2016 and signed to DevilMind Productions. The name translates from German as "battle vehicle," and the band explores themes of death, blasphemy, and ritual darkness, with their 2019 demo "Stalking of Death" as their primary release.

Karadima is a grindcore/death metal band from the Valparaíso region of Chile, whose name references Fernando Karadima, the Chilean Catholic priest found guilty by the Vatican in 2011 of sexually abusing minors — a deliberate act of social provocation consistent with grindcore's tradition of confrontational naming. The band released their debut full-length Desde hoy seré tu dios in 2018, followed by the nano-EP Torcido and the album Mansión Guarén, both in 2020, all produced through Calaka Records.

Karras is a death metal band from Río Grande, Tierra del Fuego, Argentina, whose name was taken from the character Father Damien Karras in the film The Exorcist. Operating as an extreme power trio, they released Precisión Quirúrgica in 2018 and None More Heretic in March 2020, with former members Víctor Barría and Franco Luna going on to form Cadáver 322.

Katarock is a thrash/death metal band from Florencio Varela, Buenos Aires, Argentina, originally formed in 1993 and later resuming activity from 2016 onwards. Their early releases include a five-track demo from 1994 and the promo single "Mutilador" from 2001. The band contributed the track "Bailanteros Q.E.P.D." to the 1997 Argentine metal compilation Nuevos Guerreros Vol. 1 on Yugular Records.

Katastrofy is a death metal band from Anchieta, Espírito Santo, Brazil, formed in 2006 and operating independently throughout their career. The band contributed the track "Blasphemy Or Die By Lie" to the Fortaleza Metal Vol. IV compilation in 2008, marking their earliest documented recording. Their lyrical themes center on blasphemy, death, and anti-religious subjects.

Khazad Dûm is a black/death metal duo from Uberlândia, Minas Gerais, Brazil, founded around 2014–2015 by Noatún (guitars, vocals) and Gothmog (bass), drawing their name and lyrical themes from Tolkien's Middle-earth mythology. The band released the EP Garmadh in 2017 before issuing their debut full-length Khásma (BloodRock Records, 2019), which blends old-school extreme metal aggression with NWOBHM and doom influences, acoustic passages, and piano. A remastered edition of Khásma was released through Masked Dead Records in 2023.

Khronic Infection is a Brazilian death metal band formed in 2018, active under the Bandcamp name Chronic Infection. The band released their debut material in 2018 and continued developing a blunt, aggressive death metal sound, culminating in the 2026 full-length Worldwide Metastasis, an eight-track record whose titles — including "Womb of Rot," "Putrefaction of Humanity," and "Priests of Hate" — reflect the band's uncompromising extremity.

Khrophus is a death metal band from São José, Santa Catarina, Brazil, with roots stretching back to 1993. The current lineup features Leonardo Chagas (vocals, bass), Adriano Ribeiro (guitar), and Carlos Fernandes (drums), and the band has built a steady discography including Presages (2009) and Eyes of Madness (2013), the latter a ten-track album showcasing their straightforward, groove-driven approach to old-school death metal.