Kruyssen is a progressive metal band from Mossoró, Rio Grande do Norte, Brazil, led by guitarist, vocalist, and producer Israel Tenório alongside Pedro Silva (bass), Edson Estevam (keyboards/backing vocals), and Wesley Silva (drums). The band released their concept album Metanoia in February 2023, a record whose lyrics address life, human values, and personal transformation. The album's single "Mist" received a music video and was made available across all major streaming platforms.

Kryour is a melodic death metal band from São Paulo, Brazil. Their debut album Where Treasures Are Nothing, released on June 5, 2019 and recorded at Hard Base Studios with producer Diego Castro, is a conceptual work tracing the arc of a life from birth to death through its lyrics and song sequence.

Krystal Tears was a melodic heavy metal and hard rock band from Rio de Janeiro, Brazil, formed in 2000. The quintet — Roberto Sans (vocals), Davis Ramay (guitar), Diego Padilha (bass), Rigel Romeu (keyboards), and Leonardo Peccatu (drums) — released a self-titled demo in 2001 and their debut full-length A Brand New Life in 2005, a 13-track album running over an hour in length.

Krytik is a death metal band from Minas Gerais, Brazil, formed in 2020. Their debut album Mutilated was released in June 2020, establishing their place in the state's active underground extreme metal scene.

Ktharsys is a heavy/power metal band from Caracas, Venezuela, founded by guitarist Martha Yánez. The band released their debut full-length, "Tras las huellas," in 2019 — an 11-track album recorded at OMG Productions that explores themes of emotional struggle and introspection, available as a free download on Bandcamp. The project draws on classic heavy metal foundations while maintaining an independent, self-produced ethos within the Venezuelan metal scene.

Kuarup is a Brazilian sludge/doom metal trio formed in 2025 by current and former members of Nekkrofuneral, A Peste, and Omfalos — José Antônio Dai Hou (bass/vocals), Fabrício Cardoso (guitars), and Vinicius Rispoli (guitars). Their debut EP, A Dor é o Combustível da Mudança, was released on March 21, 2025, blending heavy sludge riffs with melodic lead passages and lyrics in Portuguese addressing colonialism, fascism, and late capitalism.

Kubark is a grindcore band from Valparaíso, Chile, whose name is borrowed from the CIA's classified 1963 counterintelligence interrogation manual — a reference that resonates sharply given Chile's history of US-backed state violence. Their 2015 full-length Exterminados Como Ratas and 2019 EP Desintegración Interior deliver short, abrasive tracks addressing state repression, police brutality, and social collapse, and they have appeared on a Latin American grindcore split alongside bands from Peru, Colombia, and Argentina.

Kuld is a raw black metal band from Rio de Janeiro, Brazil, active since 2015. Their full-length Beyond The Black Spell, released on April 12, 2015, spans nine tracks of stripped-back, lo-fi black metal and remains available on Bandcamp.

Kuldefølels is a two-piece black metal band from La Plata, Argentina, formed in 2017 by Marcs Hegal (guitar, vocals) and Leo Asaru (drums, backing vocals). The duo released a self-titled recording in March 2017, followed by the live album "Diagonal Oscura" (September 2018) and the studio recording "La Casa de las Mentiras" (September 2019). Their Bandcamp catalog also includes cover recordings of Burzum and Darkthrone tracks.