Tethra from Novara craft death and doom metal named after the Fomorian king of Irish mythology since 2010. Over fifteen years from the Piedmontese rice capital channels Celtic mythology through crushing Italian extreme metal.

Tetractys is a groove metal band from Athens, active since 2016. Named after the Pythagorean triangular figure of mystical significance, their music channels mathematical precision through heavy, rhythmic groove metal.

Tetragon is a thrash metal band from Parkano, Finland, formed in 2015 and evolving toward progressive thrash. They combine thrash metal's aggression with increasing progressive complexity.

Tetramorphe Impure from Alessandria deliver doom and death metal under a name referencing the impure four-faced beings of biblical vision since 2025. Their Piedmontese base channels apocalyptic theology through crushing compositions.

Tetraskel is an epic blackened doom metal band from Ermua, Spain, formed in 2016. They combine epic grandeur with blackened atmosphere and crushing doom from the Basque Country.

Teufelnacht is a black metal project from North Rhine-Westphalia, Germany, formed in 2019. Their name meaning "devil's night," they deliver raw, infernal black metal.

Teuras is a black metal band from Lappeenranta, Finland, formed in 2014. Their name meaning "slaughter" in Finnish, they deliver visceral black metal.

Teutoburg Forest from Chester craft black metal named after the battle where Germanic tribes annihilated three Roman legions in 9 AD since 2008. Nearly two decades of historically-themed compositions from the English-Welsh border channels one of history's most consequential ambushes.

Teutonic is a heavy metal band from Kaisheim, Germany, formed in 2012. They play traditional heavy metal honoring the Teutonic metal legacy.