Kaustik is a stoner metal band from Jundiaí, São Paulo, Brazil, with a history tracing back to 2000. The band released their album Hard Drugs in 2009 as an independent release, drawing on heavy riff-driven stoner rock and metal aesthetics. Their lineup has included Mark Nomad on vocals and guitar, Dirty Robbi on bass, and Richard Badguy on drums.

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.

Keep the Rage is a melodic groove metal band from Bogotá, Colombia, formed in 2019. The group has released a series of singles including "Awake," "Invader Souls," and "Hidden in the Shadows," with members also active in bands such as Blazing and Ripping Flesh.

Keophsia is a melodic heavy metal band from Campinas, São Paulo, Brazil, formed in 2016. The band released their debut album Loneliness in January 2016, a ten-track record blending melodic and traditional heavy metal elements. They have maintained an independent presence on Bandcamp and SoundCloud since their formation.

Kerix was a symphonic/gothic metal band from São Paulo, Brazil, signed to Megahard Records. The band contributed the track "New Land" to both Metal Storm VI (2013) and Metal Storm – Christian Metal from São Paulo (2015), establishing them within the Brazilian Christian metal underground. They have since split up.

Kernunna is a Celtic folk metal band from Varginha, Minas Gerais, Brazil, formed by members of Tuatha de Danann and guitarist Khadhu Capanema of Cartoon. The band blends progressive rock textures with folk metal, featuring instruments including uilleann pipes, tin whistle, violin, and bouzouki. Their debut album The Seim Anew (2013) spans nine tracks and showcases the project's fusion of Celtic and Brazilian musical sensibilities.

Keter is a death/thrash metal band from Salvador, Bahia, Brazil, featuring vocalist Bawdy, guitarists George Lessa and Yury Duplat, bassist Fagner Nascimento, and drummer Renato Corpse. The band released a self-titled demo in 2008 and the live EP Caçadores das Trevas in 2009, and was elected the best metal band in Bahia by readers of Whiplash in 2010. They also contributed a track to the Headhunter D.C. tribute compilation A Deathmetallic Brotherhood in Darkest Mourning for God (Mutilation Productions, 2016).

Kevin Douglas is a self-taught instrumental guitarist from Sergipe, Brazil, working primarily in a rock and metal context. His Bandcamp catalogue includes the albums Rotten Fingers, Outlandish, Skin Spots, and Miscellaneous, showcasing a versatile approach to progressive and instrumental metal. He also produces gear-review content on YouTube, writing original tracks to accompany each video.

Key of Salomon is a Brazilian black metal band whose discography includes the demos Summoning of the Night Spirits (1998) and Illecebrarum Infernalis (1999), both self-released. The band operated in the raw, underground tradition of Brazilian black metal and has since split up.