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.

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.

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.

Killing Mass was a death/thrash metal band from Santiago, Chile, whose sole known release is the 2017 EP Bloody Lands — a five-track recording encompassing both old-school thrash and death metal styles. The band has since split up, leaving Bloody Lands as their only documented output.

Killrape is a thrash/death metal band from Rio de Janeiro, Brazil, active since 1993 under the earlier name Corrosive, founded by brothers Nilmon Filho (guitars) and Rodson Lemos (bass and vocals). The band released their debut full-length Corrosive Birth in May 2010, followed by Corrosive Legion in 2011, with subsequent releases including Corrosive Master and Corrosive Reincarnation... Reborn in Hell available via Bandcamp. Their self-described style blends aggression with destructive melodies in the tradition of extreme Brazilian metal.

Koriza is a thrash/death metal band from Ilhéus, Bahia, Brazil, with a listing on the Encyclopaedia Metallum that includes the demo "Defluxo" among their early releases. The band operates out of a city better known as a literary landmark — the birthplace of writer Jorge Amado — making them a notable presence in Bahia's underground extreme metal scene. They have maintained an active Spotify presence alongside their long-running career.