Apparatus is an experimental blackened death metal band from Copenhagen, Denmark, formed in 2014, whose extensive catalog includes the Cthulhu trilogy, Demonomicon, Yonder Yawns the Universe, and HM-2. The band draws heavily on Lovecraftian cosmic horror themes, building a thematic universe around the eldritch mythology across their releases.

Appendix is a gothic rock and metal band from Bruhl near Cologne, Germany, formed in 2020, blending the dark romanticism of gothic rock with the heavier edge of metal. The band operates in the Rhineland region, contributing to the gothic metal tradition that has deep roots in the German scene.

Appomattox is a heavy and power metal band from Geislingen an der Steige in Baden-Wurttemberg, Germany, formed in 2008, named after the site of the American Civil War's conclusion. The band delivers power and heavy metal from the Swabian Alb foothills, merging historical themes with the genre's characteristic power and melody.

Approx blends heavy metal with progressive metal from Trondheim since 2017. Their mathematical-imprecision name suggests compositions that approach perfection without claiming to achieve it.

Belarusian black metal project whose 2023 EP "Ahonija Niabiosaŭ" (recorded 2020–2021) features three tracks with titles entirely in Belarusian-language transliteration, suggesting a connection to the country's linguistic and cultural identity. The project operates in raw, atmospheric black metal territory with a minimalist, underground aesthetic.

April 16th brings NWOBHM-inspired heavy metal from London since 2021, channeling the golden era of British metal through their date-specific name. Their approach honors the traditions of the genre that London helped create.

April Hope crafts depressive and post-black metal from Ufa in Bashkortostan since 2009. Their springtime-optimism name creates a devastating contrast with the emotional devastation of their DSBM compositions from the Ural-Volga region.

April Weeps creates melodic groove and gothic metal from Dunajská Streda in the Žitný ostrov since 2013. From this Hungarian-majority town in Slovakia's Danube island region, they bring over a decade of tearful melodic compositions.

Aprosopy is a death metal band from Dresden, Germany, formed in 2013, whose name references the medical condition of facial absence, fitting the genre's fascination with bodily horror and medical pathology. The band contributes to Dresden's active extreme metal underground.