Lycanthropy was a death/thrash metal band from Ituiutaba, Minas Gerais, Brazil, active from the late 2000s. They released a debut demo in January 2009 and earned an honorable mention at the 2008 FECAP Pontal Song Festival with their track "Run While You Can," performing at shows across multiple Brazilian cities before splitting up.

Lykanthropia is a traditional heavy metal band from São Gonçalo, Rio de Janeiro, Brazil, whose themes center on lycanthropy, werewolves, and medieval battles. The band is listed on Encyclopaedia Metallum with the album "Werwolf" among their releases, operating as an independent act.

Lymphangiomas was a sludge metal and grindcore band from Barranquilla, Colombia, active from 2022 to 2025 and released through Aborto de Perra Records. During their brief run the band issued several EPs and splits, including "64 Traxx," "Cancrum Oris," and "Gangrena De Fournier Vulvar," all released in 2022.

Lyria is a symphonic alternative metal band from Rio de Janeiro, Brazil, founded in 2012 by mezzo-soprano and songwriter Aline Happ. The band released their debut album "Catharsis" in 2014 and followed it with "Immersion" in 2018, both funded through crowdfunding campaigns that raised over $8,000 and $13,000 respectively from fans worldwide. Lyria won the Palco MP3 award for most-accessed heavy metal artist in both 2016 and 2017, and their songwriting frequently addresses themes of mental health, autism, and neurodiversity.

Lyriahn is a metalcore band from Santiago, Chile whose lineup includes vocalist Sandra Mayfair, guitarist Prema Sagar, bassist Axel Loaiza, and drummer Rolando Martínez. The band released the tracks Tempus and Mind Circuitry in 2018, showcasing a sound rooted in modern alternative and experimental metal.

Lábar'Oculto is a black/doom metal band from Piraju, São Paulo, formed in 2017, whose lyrics draw on poetry, literature, and occultism. The band released their self-titled debut album in 2020 through Misanthropic Records and Black Hearts Records, recorded at Amarello Sound Studio between 2017 and 2019. The album was preceded by the single Lábar'Oculto (Contravulgata) and a live recording from UMF XVIII.

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.