Grietas are an alternative metal band from Reconquista, Santa Fe, Argentina, with Nicolás "Cabeza" Saucedo (guitar and lead vocals) as the sole continuously active member alongside Guillermo Tortul (bass) and Facundo Lopez (drums). Their second studio album "Secuelas" was released in late 2020, recorded at Coda Studio in Reconquista and mixed and mastered by Lian Gerbino at White Door Studio in Malmö, Sweden. The title track features guest appearances from Fabricio Faccioli (ex-Vorgrum, ex-Treno) and Lian Gerbino of Tersivel.

Grim Crypt is a one-man death/thrash metal project from Tôrres, Rio Grande do Sul, Brazil, helmed by guitarist Lucas HR and formed in 2023. The project released "Reborn" in 2023 and followed it with the album "Absolute" in May 2024, showcasing a home-recorded, technically-driven approach to the genre.

Grimpha is a death metal band from Curitiba, Paraná, Brazil, formed in 2015. The band released the demo "Induced Hate" in 2018, establishing themselves within the Brazilian underground death metal scene.

Grimtotem is a female-fronted pagan/folk metal band from Arauco, Bio-Bío, Chile whose music draws from the legends, myths, and history of the Mapuche and Chiloé cultures of southern Chile. Their discography includes the demo "Wengan" (2014), the album "Invunche" (2016) — which invokes the Mapuche mythological figure of the invunche as a metaphor for colonial violence — and two further albums, "Espíritu Del Bosque" (2021) and "El Golfo Y El Humedal Resisten" (2022).

Grimvar Nihilarch is a one-man raw black metal project from Manaus, Brazil, active since 2016. The sole member has released a steady stream of material including the recordings Forças Destrutivas do Norte, Soberania Niilista, Vazio Existencial Perpétuo, Macabro, and Entorpecido, all self-released through Bandcamp.

Grimörio is a black metal band from Rio Grande do Sul, Brazil, with roots tracing back to 2011. The band is listed on Encyclopaedia Metallum with the release "Prophetiae" among their discography, operating as an independent underground act.

Grind Convulsion are a brutal death metal and grindcore band from Santa Fe, Argentina, signed to Inhuman Therapy Records. Their 2014 EP "Rebirth of Blood" includes tracks such as "Putrefaction In Crescendo," "Grotesque Deformity," and "While I Use Your Remains," along with two live recordings from the GFF '13 festival. The band also contributed tracks to the Argentine extreme metal compilations "Argentina Extrema Vol. 2" (2015) and "8 Ways to the Internal Rot" (2016), with Pat on bass, Juan C. on guitar, and Ismael on drums.

Grindeals is a grindcore and death metal band from Recife, Pernambuco, Brazil, formed in 2020. The independent act explores lyrical themes of violence, psychological struggle, death, and addiction within a brutal extreme metal framework.

Grinding Reaction is a thrash metal and hardcore band from Diadema, in greater São Paulo, Brazil. The band blends old-school and new-school hardcore with thrash and groove metal while tackling political and social themes, and has released material including the EP Tempo, Persistência e Fúria and a full-length album featuring fifteen original tracks.