C.F.C. (short for "Cash for Chaos") is a thrash metal and crossover band from Goiânia, Goiás, Brazil, that has since split up. The band played politically charged and socially critical music, addressing themes of daily struggles, society, and systemic issues in their lyrics. They operated as an independent act within the Goiânia underground metal scene.

C.R.U.E (Comando Resistência Underground Extremo) is a black/death metal band from São Paulo, Brazil, active within the city's underground extreme metal scene. The band is signed to Brazilian Ritual Records, under whose banner they released a split with fellow São Paulo act Transgressor featuring their material "Metal das Ruas" in 2021. Their music is rooted in the raw, aggressive tradition of Brazilian underground metal.

Caballo Salvaje is a heavy rock band from Centenario, Neuquén, Argentina, who describe their sound as "Patagonian heavy rock" for its roots in regional folk alongside raw metal energy. They released their debut album Donde nace el viento in 2014 and followed it with Loncorock in 2017, both recorded in Neuquén. Their material reflects a strong regional identity and social awareness, with themes drawn from Patagonian life woven into hard-driving riffs.

Cabo de Hornos is a death metal and grindcore band from Monteros, Tucumán, Argentina, featuring Alberto on guitar and vocals, Marco on guitar, Francis on bass, and Tigre on drums. The band released their album Let Them Die, a blunt and uncompromising assault that represents the extreme underground of Argentina's northwestern provinces. Their sound sits at the intersection of grinding brutality and death metal heaviness.

Cabresto was a heavy metal band from Campana, Buenos Aires province, Argentina. The band's lineup included vocalist Emmanuel "NIZ" Echegaray, guitarists Lucas Galarza and Juan Pablo Rodoni, bassist Mario Mansilla, and drummer Leo Graf, with several members connected to the local Campana metal scene through other acts. They released a demo showcasing a direct, traditional heavy metal approach before eventually splitting up.

Cabrocordero is an experimental sludge and stoner metal duo from Buenos Aires, built around bass and drums in a format that recalls Big Business in its stripped-down but crushing heaviness. Their 2011 full-length Namastie Qoh — nine tracks and over fifty minutes of fuzzed-out riffs and noise experiments — earned recognition from international metal press as a standout in South American heavy music. The band has cited a philosophy of musical transmission, describing their compositions as a kind of channel for sonic energy rather than conventional songwriting.

Cachorro da Duença is a grindcore band from Caruaru, Pernambuco, Brazil, formed in 2014. The band channels political indignation and social critique — addressing themes of religion, self-management, and human freedom — through short, furious bursts of extreme music. Their releases include the demo "Degradação Humana" (2014) and the split "4 Ways to Grind" (2017), and they have participated in international underground compilations.

Cactek is a deathrash project from Rio de Janeiro, Brazil, formed by guitarist Pedro de La Rocque with the aim of channeling the raw energy of early death and thrash metal. The band released their debut EP "Sunrise in Hell" in September 2023, produced by Dan Swanö, and was featured among ten notable underground Brazilian acts to watch in 2024. Their sound blends technical thrash with death metal aggression in the tradition of the classic Brazilian extreme metal scene.

Cadalso is a progressive heavy metal band from Santiago, Chile. The band released their self-titled debut album in January 2020 through a consortium of labels including ROAR Records, PureSteel Records, Eonian, and Steel Gallery, featuring seven tracks that blend traditional heavy metal with progressive structures.