Kassiuz is a heavy metal band from Pico Truncado, Santa Cruz, Argentina, widely regarded as one of the pioneering acts of Patagonian heavy metal. The band self-released their debut demo in 2014, featuring tracks including "El Judas," "Redencion," "Primitivo Tehuelche," and "Patagonia," all recorded and mixed in their hometown. Their 2018 album Amigo de Metal featured a guest appearance by Carlos Cabral of veteran Argentine metal band Tren Loco on the title track.

Kavla is a heavy metal and hard rock band from São Paulo, Brazil, with origins dating to 1992. The band released the album Dream or Reality in 1995 and returned after a hiatus with Surreal in 2008, building a catalog rooted in melodic traditional heavy metal. Their current lineup features Thiago Cicilini on vocals, Sandro Silva and Fábio Silva on guitars, Carlos Ceroni on keyboards, Marcelo Eiger on bass, and Nina Pará on drums.

KillMister is a heavy metal band from Santos, São Paulo, Brazil, formed as a Motörhead tribute act before developing original material. Their EP Ride Down to Hell (June 2018) — produced, recorded, mixed, and mastered at O Beco Estúdio in Santos and limited to 500 copies — features original compositions alongside live bonus tracks. The band is fronted by vocalist Luiz Carlos Louzada, known from the Brazilian metal veterans Vulcano.

Kriver was a metal band from Recife, Pernambuco, Brazil, active from 2009 to 2014. Beginning with a heavy metal and hard rock approach, the band evolved toward progressive metal over three EPs, culminating in "Foresight" (2014), a four-track release praised for its blend of heavy riffs, intricate melodies, and atmospheric songwriting. The lineup included Rafael Gorga (vocals), Bruno Oliveira and Marcelo Neves (guitars), Guilherme Cordasso (bass), and Ricardo Lira (drums).

Kronus was a heavy metal band from Rio de Janeiro, Brazil, active from 1985 to 1988. The band released a rehearsal demo in 1985 and a demo titled "Muerte Lenta," covering themes of fantasy, freedom, and war before dissolving.

Latifundio was a heavy metal band from Concordia, Entre Ríos, built around brothers Alejandro Ferrando (vocals) and Pablo Ferrando (drums), joined by guitarist Matías "Bochi" Benítez. The band released two independent albums — "Herejías" (2004) and "Piel de Metal" (2017) — with lyrics addressing social, religious, and political themes.

Letalis are a speed and heavy metal band from Santiago, Chile, formed in 2021 by members including vocalist Jacqueline Jara. Drawing from 1980s speed metal influences, the band released their debut album Bestia Oculta in 2022 and followed it with Verdadero Poder in November 2025, the latter praised for tighter songwriting and a more fully realized sound within the genre.

Letargo was a heavy metal band from Buenos Aires, Argentina, formed in 1999 under the earlier name Xeus, with members including vocalist Jorge Cabrera, guitarists Diego Prado and Gonzalo Anselmi, and drummer Cristian Gagliardo. The band released their studio album "Derribando al enemigo" in 2003 and appeared the same year on "Mátenlos a todos: Tributo argentino a Metallica," a compilation of Argentine bands covering Metallica songs. The group subsequently split up.

Lethal is a thrash/heavy metal band from Florida, Buenos Aires, founded in 1988 by former members of Legión, that quickly became one of Argentina's most recognized metal acts, opening for international headliners including Sepultura, Pantera, and Anthrax. Their debut album "Bienvenidos a mi reino" (1990) featured the track "King of the Ring," voted best Argentine song of the year by readers of Madhouse magazine, and they followed it with notable releases "Maza" (1994) and "Efecto tequila" (1996). After a hiatus, the band reformed and has continued releasing music, including "Inyección Lethal" (2010) and "Somos thrash" (2023).