Lápide was a thrash metal band from Porto Alegre, Rio Grande do Sul, active from 1996 to 2012. The band released two studio albums — Infinite Life After Death (2003) and Over the Grave (2008), the latter through the Voice Music label — and were recognized as one of Rio Grande do Sul's notable thrash acts. The line-up during their later years featured Rogério Pires on vocals and guitar, Eduardo Martinez on guitar, Gustavo Strapazon on bass, and Hercules Priester on drums.

Lazaro is a thrash metal band from Rafael Castillo, Buenos Aires, founded by guitarist Jorge Moreno following his departure from the long-running Argentine thrash act Serpentor. The band carries on the tradition of socially and politically charged thrash metal from the Greater Buenos Aires underground scene.

Lâmmia is a stoner/doom metal band from Rio de Janeiro, Brazil, formed in 2018, pairing heavy and dense riff-driven instrumentation with bluesy female vocals. The band released their self-titled EP in 2018, which includes the track "Acid Trip," and has been featured in compilations spotlighting the Brazilian stoner and doom scene. Their sound draws on heavy psych and classic doom traditions while retaining a distinctly soulful sensibility.

Lævateinn is a raw black metal project from Bogotá, Colombia, operating under the Aryan War Distribution label and releasing material on the themes of WWII and war. The one-man project, credited to Tyrant Soldier, released two EPs and a demo in 2025 before appearing on the 2026 compilation "Art of War."

Lōtico is an atmospheric sludge and post-metal band from São Paulo, Brazil, formed in 2022. The five-piece lineup — Juliana Lellis, Leonardo Simões, Bruno Araújo, Guilherme Xavier, and Pedro Ferreira — quickly established themselves with the debut release Ressonância (2022), followed by the albums Oran and Indulgência, both released in 2023. Their sound blends crushing sludge weight with expansive atmospheric textures.

M-19 is a thrash metal band from Porto Alegre, Rio Grande do Sul, Brazil, originally formed in 1989, drawing influence from Slayer, Destruction, Kreator, and Sepultura. After releasing demo tapes "Manifest of Insanity" (1989) and "When a Promise Is Broken" (1994) and a decade-long hiatus, the band returned to release the full-length "Mission: Destroy" in 2013 and "Sic Semper Tyrannis" in 2019, the latter celebrating thirty years of their founding.

M.A.S.A.C.R.E is a heavy metal institution founded in Lima, Peru in the mid-1980s, regarded as one of the most representative metal bands in South America. The band has shared stages with acts including Iron Maiden, Paul Di'Anno, and Rata Blanca, and has appeared on international tribute albums honoring Argentine legends V8 and Colombian band Kraken. Their catalog includes four full-lengths, with the thrash-oriented albums "Demoledor" (2001) and "Versos del inframundo" (2016) among their later work.

M.D.K. is a brutal death metal and grindcore band from Jundiaí, São Paulo, Brazil, formed in 1997 by core members Thales Zago (guitars/vocals), André Lazarini (drums/bass), and Boca (vocals). The trio released three studio albums—"Splatterguts" (2005), "Cuntanasia" (2009), and "Into the Pussymorgue" (2012)—alongside a prolific run of splits with international goregrind acts including Malignant Tumour, Kadaverficker, and Rotten Penetration.

M.H.X's Chronicles is a melodic death metal band from São Paulo, Brazil, founded by guitarist and vocalist Murillo Henrique Xavier, whose initials give the band its name. The project expanded into a full quartet with Raphael Carvalho on drums, Michel Oliveira on guitars, and Wallace Ribeiro on bass, releasing the EP "The Preface" (2013) and the fifty-six-minute debut album "Infinite Ocean" in 2015, recorded at Sputnik Home Studio.