Crypta is a death metal band formed in São Paulo, Brazil in 2019 by former Nervosa members vocalist and bassist Fernanda Lira and drummer Luana Dametto, completing their lineup with guitarists Tainá Bergamaschi and Sonia Anubis. The band released their debut album Echoes of the Soul on June 11, 2021 via Napalm Records to widespread acclaim, establishing themselves as one of the most prominent acts in contemporary Brazilian death metal. Their 2023 follow-up Shades of Sorrow further cemented their international profile.

Crystal Lake is a thrash metal band from Leme, São Paulo, Brazil, with roots tracing back to the late 1990s and a current active lineup. The band has released albums including Terror Machine (2007) and Death Row (2018), playing a straightforward traditional thrash metal style. They remain active in the Brazilian underground metal scene.

Crânio is an independent thrash metal band from João Pessoa, Paraíba, Brazil. The band plays aggressive thrash metal and is part of the underground metal scene in the northeastern Brazilian state of Paraíba, with their music available on Bandcamp.

Cubos is a death metal band from Viña del Mar, Chile, who describe their style as "modern old school death metal" and pair it with a pixel art aesthetic. Their debut album "Música para el Fin del Mundo" was released in August 2020 and includes seven tracks, among them "Interludio 8 bit," reflecting their chiptune-influenced visual and sonic identity.

Cuero was a heavy/power metal band from Buenos Aires, Argentina, whose lineup included vocalist Enrique Gomez Yafal and guitarist Christian Vidal. The band released a full-length album titled Heavy Metal and contributed a cover of Master of Puppets to the Argentine Metallica tribute compilation Mátenlos a todos in 2003.

Culmen is a raw black metal band from Chavín, Ancash, Peru, formed in 2022. Signed to From Deepest Records, they released their debut single in 2022 and followed it with the EP "De un soplo la creación" in 2024, exploring themes of philosophical delusions and dreams through a harsh, minimalist black metal approach.

Cult of Enthropy is an instrumental black metal band from São Paulo, Brazil, formed around 2020. The band released their debut album Embrace the Void on October 21, 2020, followed by a limited physical CD edition of 100 copies in May 2021. Their music is entirely instrumental, exploring atmospheric black metal textures without vocals.

Cult of Horror is a black/speed metal trio from Rio de Janeiro, Brazil, formed in 2015 and featuring members with ties to underground acts including Whipstriker, Apocalyptic Raids, Comando Nuclear, and Bordel Inferno. The band released their debut album Babalon Working in April 2016, recorded at Tokaia Studio in Rio de Janeiro, blending first-wave black metal rawness with Motörhead-influenced speed metal and d-beat punk rhythms. Their sound draws thematic inspiration from cult horror cinema and occultism.

Cultiveta is a psychedelic stoner metal band from Buenos Aires, Argentina, formed in 2019. Their debut release, the album Fumus Enim Omnia, appeared on Bandcamp in March 2019, showcasing sprawling, fuzz-drenched riffs rooted in the Argentine underground heavy scene.