Icon of Sin is a heavy metal band from Curitiba, Brazil, built around vocalist Raphael Mendes, who rose to prominence through viral YouTube covers in which he mimicked the voice of Iron Maiden's Bruce Dickinson. The band recorded their self-titled debut album in Curitiba and released it in 2021 through Italian label Frontiers Music Srl, followed by the second album "Legends" in 2023. Their sound draws heavily on classic 1980s heavy metal, with Iron Maiden and Dio-era Black Sabbath cited as primary influences.

Ignis is a heavy metal band from Buenos Aires formed around 2012–2013, built around vocalist Rudy Losada, guitarists Juan Mori and Flavio Lema, bassist Litto Salerno, and drummer Fernando Palamara. The band released their second album Inframundo in 2024, rooted in traditional and melodic heavy metal in the classic European style.

Ignited is a traditional heavy metal band founded in 2017 in Balneário Camboriú, Brazil, by vocalist Denis Lima, guitarist Dalton Castro, bassist Martin Bellucci, and drummer Maurício Velasco. Their 2019 debut full-length "Steelbound," produced by Thiago Bianchi in São Paulo, established the band in the international heavy metal circuit and surpassed 200,000 Spotify streams. The follow-up "Cradle of the Wicked" was released in October 2023, recorded at Studio Fredman in Gothenburg, Sweden and produced by Fredrik Nordström, known for his work with Arch Enemy and Dimmu Borgir.

Ignition is a heavy metal band from Buenos Aires whose album A New Conspiracy was recorded between February and May 2015 at Yutoshi Studios in Buenos Aires, with drums tracked separately at Samurai Studio and mixing and mastering handled by Matt Aresti. The band is listed on Metal Archives as an independent act.

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.

Incidamus is a dark heavy metal project founded in Buenos Aires, Argentina by a musician known as Desgarro, drawing on themes of depression, betrayal, and isolation. The band released the album "El Hedor, La Ruina, La Sangre" in December 2017 through Despreciable Realidad Fanzine, an eight-track record that showcases their bleak, heavy-punk approach.

Indiscipline is an all-female heavy metal power trio from Rio de Janeiro, formed in 2014. The band released their debut EP "In My Guts" in 2014, followed by the full-length "Sanguinea" through Shinigami Records in April 2017, and the three-song digital EP "Psalms of Darkness" in 2019. Their lineup features Alice D'Moura on vocals and bass and Maria Fernanda Cals on guitar.

Indominus is a heavy metal band from Salvador, Bahia, Brazil, formed around 2015–2016. The band released the EP "Theater of War" in 2017, marking their entry into the Salvador metal underground scene.

Inhibidor is a heavy metal band from Rosario, Argentina, formed in 2020 by Alberth Páez. Their debut album "Vértigo" was released in January 2022 and featured guest contributions from members of established Argentine metal acts including Horcas, Tren Loco, and Serpentor, reflecting the band's connections across the country's heavy metal scene. The album includes a cover of the classic RIFF song "En la Ciudad del Gran Río" alongside original material.