Theatrum have been constructing progressive metal compositions from Riga since 2012, making them one of Latvia's longer-running acts in the genre. Their music balances technical proficiency with atmospheric depth, reflecting a theatrical approach that lives up to their name.

Thenatos from Sant Climent Sescebes in the Catalan Empordà region blend power and progressive metal under a death-referencing name since 2022. Their northeastern Spanish village, near the French border, provides a distinctly Mediterranean backdrop for their epic, technically ambitious compositions.

Thence is a progressive metal band from Kuopio, Finland, formed in 2016. They craft intricate progressive metal from the eastern Finnish lake region.

Theraphosa from Paris craft progressive and groove metal named after the goliath birdeater tarantula — the world's largest spider — since 2018. Their arachnid namesake drives compositions as massive and predatory as the creature itself.

Therva from Prague craft progressive metal that navigates complex time signatures and layered arrangements, active since 2015 in the Czech capital's thriving metal underground. Their compositions favor intricate structural development and dynamic shifts over straightforward heaviness.

Thirty Aethyrs from Manchester craft progressive and black metal named after the thirty ethereal realms of Enochian mysticism since 2011. Over a decade of esoteric compositions from the northwest has explored each mystical plane through technically ambitious extremity.

This Broken Machine from Milan blend progressive metal and metalcore with alternative rock influences since 2012. Over a decade of malfunctioning-machine compositions from the Lombardy capital.

This I Owe is a progressive heavy/doom metal/hard rock band from Athens, formed in 2023. Their music blends progressive complexity with the weight of doom and the accessibility of hard rock.

Thisharmony from Zaragoza craft progressive death metal with a name that plays on disharmony and harmony simultaneously, active since 2000 in the Aragonese capital. Over a quarter century, they have become one of Spain's longest-running progressive death metal acts.