Atrystos delivers death and thrash metal from the Picard city of Amiens since 2019, channeling the Somme valley's historic intensity into modern extreme metal. Their Greek-derived name, suggesting something unworn or indestructible, suits their enduring approach.

Glasgow's Attica Rage built a formidable reputation across four critically acclaimed albums and extensive touring with the likes of Judas Priest, Slash, and Anthrax. Founded by brothers Richie Rage and Jonny Parr, they evolved from their thrash roots into a powerhouse of modern British heavy metal before disbanding in 2018.

Audhumpla is a death and thrash metal band from Dresden, Germany, formed in 2018, whose tongue-in-cheek releases like Udders of Men, Udder Destruction, and Chronicles of M'uh: The Endboss Trilogy reveal a band that pairs extreme metal aggression with irreverent bovine-themed humor. The band's name references Audhumla, the primeval cow from Norse mythology.

Aura Noir has been a critical force in black thrash metal from Oslo since their formation, with their 2012-onward activity continuing a legacy that helped define the style alongside Darkthrone and Mayhem members. Their pestilential blend of first-wave black metal ferocity and thrash velocity remains among the most respected in the Norwegian underground.

Aura of Pestilence has been delivering thrash metal from the southern Finnish town of Lohja since 2014, surrounding everything in their path with an infectious sonic contamination. Their plague-themed approach brings pathological intensity to the Uusimaa thrash scene.

Autarkia is a melodic thrash and death metal band from Leipzig, Germany, formed in 2016, whose name references the concept of self-sufficiency, reflecting an independent, DIY approach to extreme metal. The band combines thrash speed with melodic death metal's harmonic sensibility from Saxony's cultural capital.

Autoagresija delivers crossover and thrash metal from Čačak in western Serbia since 2017. Their Serbian name meaning 'self-aggression' captures the self-destructive energy of their punk-influenced thrash.

Autonomie delivers thrash metal, crossover, and hardcore from Hundvåg island in Stavanger since 2023. Their self-governance name suits the DIY spirit of punk-inflected thrash from this island suburb of Norway's energy capital.

Autopsia is a death and thrash metal band from Seligenstadt in Hesse, Germany, with roots stretching back to 1989, making them one of the oldest surviving acts in the German death-thrash underground. With over three decades of activity, the band predates many of the genre's conventions and has witnessed its entire evolution firsthand.