Third Island is a doom and post-metal band from Limerick, Ireland, formed in 2016. They blend the crushing heaviness of doom with post-metal's atmospheric expansiveness and dynamic builds.

Thrakian from Cardiff craft post-metal named after the ancient warrior civilization of Thrace since 2024. Their Welsh capital base channels ancient Balkanic warrior energy through atmospheric, dynamic compositions.

Tidejord blend melodic doom and post-metal under a Danish name meaning 'tidal earth,' creating expansive compositions that ebb and flow like the Nordic seas since 2023. Their sound captures the vast, oceanic quality of Scandinavian post-metal.

Tidings from Edinburgh craft post-metal and post-rock with the news-bearing weight their herald name suggests since 2012. Over a decade of message-carrying compositions from Scotland's capital has produced atmospheric, dynamically rich music.

Torpor is a sludge/doom/post-metal band from London, active since 2015. Their music builds from the heaviest depths of sludge and doom into the atmospheric dynamics of post-metal, creating immersive and physically overwhelming sonic experiences.

Tosiro from České Budějovice traverse the boundaries between doom, sludge, post-metal, and post-hardcore, creating a genre-fluid heaviness that has evolved considerably since their 2008 formation. Their willingness to incorporate atmospheric post-metal textures alongside crushing sludge riffs makes them one of southern Bohemia's most versatile heavy acts.

Toundra is an atmospheric post-metal/rock band from Madrid, Spain, active since 2009. They craft expansive, cinematic instrumental post-metal and post-rock from the Spanish capital.

Transcomar is a sludge/post-metal band from Bochum, Germany, formed in 2023. They blend sludge metal's abrasive weight with post-metal's atmospheric expansiveness.

Transhumance is a Swiss instrumental doom duo of Jo Transhume and Manu Le Bé, crafting crushing riff-driven compositions without vocals across releases like "Blood Therapy" and their self-titled "II." Their sound pairs monolithic doom heaviness with a tongue-in-cheek Swiss identity, citing raclette and wine alongside depression as creative fuel.