Culto Primitivo is a thrash metal and hardcore band from Venado Tuerto, Argentina, formed in 2017. The band — vocalist Atuel, bassist Pol, drummer Matías, and guitarist Nacho — released a self-titled debut album on September 19, 2017, delivering eleven tracks of aggressive crossover-edged thrash from the Argentine interior.

Culto Profano is a Brazilian black metal band associated with the Choduus Brotherhood, an underground collective of Brazilian black metal acts. The band released the album "Inferno" on pro CD-R in 2010 and contributed to a split titled "666" with Naberus in 2015; both releases were later compiled on "Bestial Triunfo" in 2022. The band has since split up.

Cursed Slaughter was a crossover thrash metal band from São Paulo, Brazil, known for their aggressive, old-school approach to the genre. The band released the album "Metal Moshing Thrash Machine" in 2012, a 12-track record praised for its palm-muted riffing, energetic fretwork, and ferocious vocals, alongside the EP "One Last FixXx". The band eventually split up, leaving behind a well-regarded contribution to the Brazilian crossover thrash scene.

Cursedflesh is a death metal band from Rio de Janeiro, Brazil, active since 2022 under the Metal Archives listing. Operating under the Bandcamp name Curse of Flesh, the band has released a demo and the EP "Spiritual Preservation Through Self Immolation", delivering a raw, underground death metal sound within Brazil's extreme metal underground.

CxFxCx is a crossover thrash band from Canoas, Rio Grande do Sul, Brazil, tracing their roots to the early 1990s when a group of teenage skaters formed the project in the city's underground scene. The band has remained continuously active and celebrated their 30th anniversary with a live-in-studio album recorded in a single day at Estúdio Soma in Porto Alegre, featuring 15 tracks spanning all phases of their career.

Cyber Croatoan is an extreme industrial and gothic metal project from Goiânia, Goiás, Brazil, founded by vocalist and composer Phillipe Vitriol with the aim of blending extreme metal with electronic music. The band draws influences from Cradle of Filth, Rammstein, Hocico, and Psyclon Nine, combining guttural and operatic vocals over a backdrop that shifts between industrial gothic, djent, doom, and symphonic elements. Their debut album "Past of Pain" was released in 2013, followed by the EP "New Vision of Pain" in 2019.

Cygnus Rift is a heavy and gothic metal band from Rancagua, in Chile's O'Higgins region, with themes spanning death, power, and revenge. The band released a string of singles from 2022 onward, including 'In My Darkest Hours' and 'Brother's War', before issuing their debut full-length 'Arcane Heptagon Artificers' in 2026.

Cystus is a goregrind and death metal solo project from Cuiabá, Mato Grosso, Brazil, created by the musician known as Goreterrorist, who also performs in bands including Gorempire and Heretic Razor. The project debuted in August 2021 with the demo "Putrid, Fetid and Corrosive," recorded entirely by Goreterrorist at Grotesque Homestudios in Cuiabá, blending D-beat rhythms with gore-themed death metal and grindcore extremity.

Cárcere is a thrash metal band from Rio de Janeiro, Brazil, formed in 2018. The independent band released their debut EP "Crimes de Guerra" in December 2018, a five-track slab of aggressive Brazilian thrash rooted in the classic traditions of the genre.