Kamikaze is a heavy metal and hard rock band from Belo Horizonte, Minas Gerais, originally formed in 1984 and reactivated in 2016. The band released a self-titled EP in 1986 featuring the track "Machado de Guerra," which became an anthem for an entire generation of Brazilian metal fans, and followed it with the full-length Kamikaze II in 1990 on Cogumelo Records. A 2023 reissue collected both early records alongside six previously unreleased tracks from 1994.

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.

Killepsia is a progressive and heavy metal band from Porto Alegre, Rio Grande do Sul, Brazil, formed in 2015 by guitarists Vicente Queiroz Silva Telles and Giuseppe Oppelt Delazeri, bassist and vocalist Ian Garbinato de Fagundes, and drummer Rafael Severo Meira. The band released their self-titled debut EP in June 2017, a four-track record that addresses themes of uncertainty, societal expectation, and the passage of time, marking them as a notable presence in Porto Alegre's heavy metal scene.

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.

Knock Out is a heavy metal and hard rock band from Buenos Aires, Argentina, formed in 2013. They released the eleven-track album "Sin Vergüenza" in May 2015, and later appeared on the CROM Records compilation "CR 021 — Nuestro Infierno" (2021) with the track "Pisando Fuerte". The band operates as an independent act and maintains an active presence on Bandcamp.

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.

Kybalion is a heavy metal band from Lanús, Buenos Aires, built around brothers Leonardo Fracchia (vocals/guitar) and Maximiliano Fracchia (drums), alongside guitarist Aldo Leipus and bassist Diego Moreno. The band released the full-length album "Hacete cargo" in 2004 on Del Imaginario Discos, and issued a live recording, "Live Sessions," in May 2024 through Black Metal Musicians Productions.