Translunaria from Přerov fuse death metal's brutality with progressive metal's structural ambition, creating technically demanding compositions that shift between aggression and atmospheric passages since 2015. Their name evokes the cosmic and otherworldly themes that inform their progressive approach to extreme metal.

Traumatic Voyage is an avant-garde/progressive death/black metal band from Munich, Germany, active since 1992. With over three decades of boundary-pushing extreme metal, they are among the most veteran avant-garde acts in the German scene.

Tree of Sores is a progressive sludge metal/post-hardcore band from Leeds, active since 2010. Their music weaves together the crushing weight of sludge with the complexity of progressive structures and the emotional dynamics of post-hardcore.

Treedion is a progressive death/thrash metal band from Dresden, Germany, formed in 2012. They combine progressive complexity with death and thrash metal's aggression.

Trepalium formed in Boismé, France in 2001, developing a death metal style inflected with groove, progressive structures, and jazz and blues elements that placed them within the eclectic wing of the French extreme metal scene. Their debut Through the Absurd (2004) was produced by Joe Duplantier of Gojira, establishing a connection to the broader French extreme metal network sometimes referred to as the Konosphere. Alchemik Clockwork of Disorder (2006) and XIII (2009) followed, each leaning further into the band's genre-blending approach. Trepalium remained active through 2024, over two decades of consistently unconventional extreme metal.

Trepanation Process from Rennes deliver progressive death metal named after the ancient surgical practice of drilling holes in the skull since 2019. Their neurosurgical concept drives technically demanding compositions from the Breton capital.

Trinity from Thun, Switzerland have been crafting progressive heavy metal since 2010, weaving intricate arrangements and dynamic songwriting into a foundation of classic metal power. Their compositions balance technical ambition with melodic sensibility, reflecting the tradition of European prog-metal craftsmanship.

Triple 7 combine progressive, power, and thrash metal from Venlo on the Dutch-German border, creating a technically ambitious hybrid that draws from three distinct subgenres since 2012. Their willingness to blend melody, complexity, and speed sets them apart in the regional scene.

Troubled Mind is a progressive metal/rock band from Móstoles, Spain, active since 2000. With over two decades of activity, they are a veteran progressive act in the Madrid scene.