Louder than Hell is a traditional heavy metal band from São Paulo, Brazil, founded in 2021 by Rock'n Rafa (also of Metaltex) and guitarist Fabio "Grey Wolf" Paulinelli with the stated aim of keeping true heavy metal alive. The band released their debut full-length True Metal till the End in 2021, followed by Possessed by Steel. Their sound draws firmly on classic NWOBHM and US power metal influences.

Lovecraft are a melodic heavy metal band from Buenos Aires who issued three independent productions across their career: Más allá de la Tormenta, Las Sagradas Escrituras (1994), and En el Fragor de la Contienda (2001). The band was co-founded by bassist Gabriel Clemencot and drummer Darío Aguila, with vocalist Leandro Javier Batalla joining for Las Sagradas Escrituras alongside guitarists Julio Orué and Ale Sarco. The band has since split up.

Low Levels of Serotonin is a melodic death/doom metal project from Americana, São Paulo, Brazil, led by multi-instrumentalist Wilian Gonçalves, formerly the guitarist of Desdominus. The band released their debut album Katharsis in 2019 through Heavy Metal Rock Records, followed by a second album, In the Entrails of My Mind, in 2022. Their sound combines heavy, melancholic riffing with introspective lyrics and significant tempo variation across both records.

Low Life is a thrash/crossover metal band from Brasília, Brazil, known for high-speed, aggressive material rooted in the city's underground scene. In 2023 they released a split with fellow Brasília act D.F.C. titled Thrashformation, issued on limited yellow vinyl. The band returned to live activity in 2025 after a decade-long hiatus.

Lucas Shred is a progressive metal and shred guitar solo project from Curitiba, Brazil, launched in 2022 by guitarist Lucas Shred, who also serves as lead guitarist for the Curitiba-based traditional heavy metal band Wild Witch. The project draws influence from Brazilian guitar virtuosos such as Kiko Loureiro of Angra, and Lucas has additionally played in the traditional metal bands Hell Gun and Phantom Star.

Lucifer's Doom is a black/doom metal band from Rio de Janeiro, Brazil, active since 2015. The band released a self-titled EP in June 2015, a three-track CDr debut that blends avant-garde black metal atmospherics with mournful doom sensibilities. Their sound features high baritone vocals over heavy, slow-burning riffs with lyrical themes drawn from Christian eschatology.

Luciferi was a black metal band from São Paulo, Brazil, whose sole verified release is the 1994 demo cassette Thy Fullmoon Rites, featuring five tracks including "Cold Shadows over Transylvanian Moon" and "In the Mystic Fire of Hades." The demo was recorded by a two-core lineup operating under the pseudonyms Lord of the Darkness and Beelzebuth Guardian. The band also appeared on the Teach Your Soul with Fire underground compilation tape before dissolving.

Luciferiano is a black metal band from Joinville, Santa Catarina, Brazil, operating independently with lyrical themes centered on anti-Christianity. The band remains active in the Joinville underground metal scene, performing at events such as the Espíritos Amaldiçoados black metal showcase in March 2025 alongside Alocer and Zorthis.

Luctus' Hydra is a depressive black metal band from Santiago, Chile, founded in 2002 by multi-instrumentalist and vocalist Draco. The band has released five studio albums, from their debut Screams and Laments from the Deepest of the Soul (2009) through Crónicas de una Eterna Agonía (2020), charting a course from harsh black metal to more melancholic and introspective territory.