Demencia is a thrash metal band from Iquique, Tarapacá, Chile, tracing its roots to the mid-1990s hardcore act Kaníbal Kañero before evolving toward a sound shaped by Kreator, Destruction, Dark Angel, and Obituary. The band released several demos culminating in the full-length MetalDistortion in 2008 on Agresor Records, after which they entered an extended hiatus.

Demencia Extrema is an extreme metal band from Ituzaingó in the western greater Buenos Aires area, drawing on metalcore, death metal, and 1990s groove metal influences. The band released the EP Mundo Ruin in August 2015, a five-song record recorded and mixed by FedeSaurio Records in Castelar-Morón, Buenos Aires, with composer Matias Chao as a key creative force.

Dementiae is a black metal band from Santiago, Chile, whose members perform under the names Satanya, Draco, and Demonamorthus. Their debut demo Between Dementia and Death, released through Pagan Forest Records and Black Crusade Productions in a limited edition of 100 CD copies, draws on the atmospheric and depressive currents of early Burzum alongside elements of doom metal.

Dementors are a death/thrash metal band from Santiago, Chile, whose lyrics explore themes of blasphemy, violence, and dementia. The band appeared on the 2013 split release Evil Reincarnation alongside Santiago black/speed metal act Evil Force, with their tracks recorded and mixed by Jose Jara at Mazazor Studios in Santiago.

Demiurgo is a black metal band from Berazategui, Buenos Aires, formed by brothers Federico Storni (vocals/lead guitar) and Matías Storni (rhythm guitar), with Leandro González on drums and Gonzalo Villarreal on bass. The band released their debut album "Dark Feeling" (2021) on the Metal Eterno label and has supported major international black metal acts including Gorgoroth, Watain, Behexen, Horna, and Mgła at Argentine shows.

Demiurgus are a death/thrash metal band from Santiago, Chile, formed in 2019 initially as a solo project by vocalist and guitarist Manuel J.S.M., drawing influences from Human-era Death, early Sepultura, and fellow Chilean act Criminal. The band released two demos in 2019, the Spanish-language single La Decapitación de Cronos in 2022, and their debut full-length Equilibrio in 2025 through Awakening Records.

Demogorgon is a black metal band from Juiz de Fora, Minas Gerais, Brazil, catalogued on Metal Archives under ID 14292. The band operates within the Brazilian underground black metal scene, with lyrical themes focused on occult inquiries, and has been associated with the Headbanger Force label.

Demoledor is a heavy metal band from Florencio Varela, Buenos Aires, founded by Miguel "Tano" Di Bella and inspired by Black Sabbath, Dio, and Ozzy Osbourne. They released their debut album "Masticando Bronca" in 2010 on Prisa Discos and followed it with "Demonios de Mente" in 2013, recorded at La Nave Oseberg studio and produced by Pato Larralde of Sauron. The band won the heavy-thrash category at the 2010 Varela Rock festival.

Demoledora is an all-female heavy metal band from Tafí Viejo, Tucumán, whose lineup features Zaira on vocals, Gise Fernández on guitar, Maru Portillo on bass, and Sofi Portillo on drums. The band draws on V8 and Megadeth as key influences and has performed at the Tafí Viejo Limón Rock festival, establishing themselves within the regional metal scene.