Impetra is a traditional heavy metal band from Santiago, Chile, formed by two cousins and active from 2016 into 2017 before going on hold. Their debut demo "It's About Honor," recorded at Mazazor Studio in February 2016, introduced their approach to classic heavy metal with lyrical themes centered on nostalgia, excess, and self-destruction.

Impetuoso Desdém is a black metal band from Embu das Artes, São Paulo, Brazil, active since 2009 with a sound rooted in Satanism, blasphemy, and war themes. The band released the EP Luxúria... Blasfêmia Eterna in 2009, appeared on the three-way split Impetuous Infernal Terror (2012) alongside Infernal Execrator and Terror Satan, and issued their debut full-length The World Needs a Holocaust (The New Age, A Primitive World) in 2014 through Nyarlathotep Records, Terrorismo Produções, and Ventos da Morte Records. The lineup includes Harrison Cadáver on vocals and guitar, Laercius Murdergod on guitar, Annubis on bass, and Lord Agnaldus on drums.

Impietus is a thrash/death metal band from Rio de Janeiro, Brazil, formed in 2011. The band released two recordings in 2023 — the full-length Demons and the single Blind Eye — drawing comparisons to acts like Deicide and Cannibal Corpse with a no-frills approach blending death metal with thrash and grindcore elements.

Implement is a death metal band from Recife, Brazil, whose debut full-length album Bleeding Alone was released in 2019, produced, mixed, and mastered by Nenel Lucena at Mr. Prog. Studio in Recife. The trio — composed of Angelo Acácio on drums, Marcio Kizar on guitar, and Ivan Morderhay on bass and vocals — plays straightforward death metal with traces of thrash and grindcore.

Implexi is a progressive/power metal band from São Bernardo do Campo, São Paulo, Brazil, formed by Alecssandro Siqueira, Carlos Silva, and Renato Tanaka, later joined by vocalist Edu Gomes. The band released their debut EP Safest Shelter independently in May 2015, drawing on influences spanning classic heavy metal, power metal, progressive metal, and symphonic black metal. The name Implexi — Latin for "entangled" — reflects the band's aim to weave those diverse influences into a single sound.

Impugned is a grindcore project from Argentina helmed by Nicolas Grind, with international collaborators contributing guitars and bass. The band appeared on the 2021 four-way split "State of World Deception" alongside Irradiated (USA), Scumeater (Poland), and Meatus (Canada), released through Pornographic Gore Records and Grabaxiones Inframundo.

Impulse Noise is a death metal band from São Paulo, Brazil. The duo of Marcelo "Batis" (guitars, bass, and vocals) and Demétrius Locks (drums) released their debut album Aghoris in 2022, a nine-track record on which Batis composed all original material and handled mixing and mastering duties. The album draws on the technical and brutal strains of the São Paulo death metal tradition.

Impure Sacrament was a black/death metal trio from General Roca, Río Negro, Argentina, active from 2014 to 2016 under the pseudonyms D.D Profanator (vocals), Blasphemicommand (guitar and bass), and Impuregoat (drums). Their only full-length, "Cursed on the Grave", was released in October 2015 and distributed through Execración Distro.

Impurity is a black metal band from Belo Horizonte, Minas Gerais, Brazil, and one of the foundational acts in the Brazilian black/death metal underground. Active since 1988, their early output was released through the legendary Cogumelo Records, including the album Into the Ritual Chamber (1996) and Satanic Metal Kingdom, both of which helped define the raw, Satanic extremity of the South American black metal scene. Their prolific career spans more than eight full-length albums alongside splits and demo recordings.