Kilthrash is a thrash metal band from Cerro Navia, Santiago, formed in 2016 and active on the Chilean underground circuit. Their discography spans five releases including Demolición (2016), Street on Hell (2018), Kiltro (2021), Anikilador (2023), and Enjambre Asesino (2025), all recorded and produced independently at Kilhouse Estudio in Santiago.

Kimera is a thrash metal band from Castelar, Buenos Aires, Argentina, formed in 2008, featuring vocalist Francisco Diaz, guitarists Maty Diaz and Danny Almeida, bassist Fernando Díaz, and drummer Gonzalo Rillo. The band released their debut full-length En Tiempos Violentos in 2017, followed by the two-track EP Esclavos Hoy y Ayer in August 2019.

Korsakov is a crossover/thrash metal band from Alumínio, São Paulo, Brazil, formed in 2011 and active in the Brazilian underground scene. Drawing on social and political themes — alongside the more irreverent staples of corruption, violence, and rock 'n' roll — the band has released records including Radiation Exposure and Unique Remains. Their sound sits firmly in the beer-soaked, pit-ready tradition of Brazilian crossover.

Korvak is a thrash metal band from Campina Grande, Paraíba, Brazil, formed in 2019 and signed to NoSlip Records. Influenced by old-school death and thrash of the 1980s and early 1990s, the band draws lyrical themes from occultism and social criticism. Their 2023 full-length Chapter II — World's Duality stands as their most developed release, recorded across multiple studios and featuring twelve tracks of aggressive, riff-driven thrash.

Krifkill is a thrash metal band from Sobral, Ceará, Brazil, formed in 2015. The band's lineup includes Keven on guitar and vocals, Byron on guitar, Madeira on bass, and Fernando on drums. They released the five-track EP State of Despair in June 2016, establishing themselves within the Brazilian underground thrash scene.

Krueger is a death/thrash metal band from Campina Grande, Paraíba, Brazil, formed in 1987. The band's lineup has included Adriano Caminha on vocals and guitar, Zé Carlos on bass, and Maurício Mocardo on drums, and they released the full-length "Turn On to Death" in 2001 through Destroyer Records, recorded at Prosound Studio in Campina Grande.

Kruelty is a death/thrash metal band from Poços de Caldas, Minas Gerais, Brazil, formed in 2017. The band released a live album, "Kruelty Live in Poços de Caldas," in June 2017, featuring nine tracks including a cover of Cannibal Corpse's "Hammer Smashed Face," and later released the "Five Years of Blasphemy" full discography compilation.

Krushhammer is a black/thrash metal band from Belo Horizonte, Brazil, formed in 2019. The quartet — Marcel Krusher (vocals), Nekrolucifer (guitar), Alberth Desecrator (bass), and Philippe Hellish (drums) — debuted with the EP Speed Blacking Hell before releasing their first full-length, Blood, Violence & Blasphemy, in November 2022 through Helldprod Records and Iron Pegasus Records.

Kultist is a black/thrash metal band from São Paulo, Brazil, formed in 2014 and known for their conceptual approach rooted in the cosmic horror fiction of H.P. Lovecraft. Their 2019 debut album The Black Goat — featuring vocalist Dan Pacheco alongside a rhythm section of Yasmin Amaral (guitar), Karine Campanille (bass), and Letícia Figueiredo (drums) — weaves each of its eight tracks around a specific Lovecraftian entity.