Aleph Null is a stoner sludge trio from Dusseldorf, Germany, featuring Philip on guitars and vocals, Carsten on bass, and Jens on drums. Their releases, including the EPs Dale and Belladonna and the full-lengths Nocturnal and Endtime Sisters, deliver the low-end heaviness and hazy intensity that define the stoner sludge sound.

Formed in Zomergem in 2005, Alkerdeel built their sound from partially improvised garage sessions using only guitar, drum, and voice recorded on tape — no bass. Their catalog runs from the raw sludge/black crushing of De Bollaf! (2008) and De Speenzalvinge (2010) through collaborations with Gnaw Their Tongues, to the stripped-down raw black metal of Slonk (2021) on Consouling Sounds.

Allfather merges doom, groove, and sludge metal from the Medway towns in Kent since 2014, named after the Norse supreme deity Odin. Over a decade of crushing, multi-genre heaviness from the Thames estuary speaks to deep roots in the southeast's underground.

Alligator Rodeo is a sludge and doom metal band from Detmold, Germany, formed around 2014, who describe themselves as a hate-filled sludge factory lurking in the humid swamps of heavy music. Their releases, including Ghost in the Machine and Optimists Club, deliver slow, crushing doom punctuated by aggressive vocals and uptempo attacks.

Thessaloniki's Altar of the Stag blend doom, post-metal, and sludge into ritualistic compositions of primal heaviness and atmospheric depth. Since 2020, they've channelled pagan reverence and natural mysticism through crushing, slow-building sonic rituals.

An atmospheric doom/sludge metal band from Brussels, currently active and releasing music independently. Their music sits within the Belgian tradition of heavy, slow-motion atmospheric metal, and they appear in both the Metal Archives and local doom/sludge scene documentation.

Athens' Alzalam emerged in 2024 with a sophisticated fusion of post-metal, progressive metal, and sludge, building expansive compositions that shift between contemplative passages and crushing heaviness. Their Arabic-derived name (meaning 'darkness') signals a fascination with shadow and depth.

Amber Platypus delivers stoner and sludge metal from Odesa since 2021. Their delightfully absurd name — a semi-precious monotreme — brings playful surrealism to heavy, fuzz-laden compositions from this Black Sea port city.

Formed in Kortrijk in 1999 by vocalist Colin H. van Eeckhout and guitarist Mathieu Vandekerckhove, Amenra built one of Europe's most intense post-metal discographies with their six-album Mass series (2003–2017) on Neurot Recordings and their own Church of Ra imprint. Their live performances — historically accompanied by acts of ritual self-harm on stage — carry an emotional and physical weight described by many as akin to attending a funeral.