Triangle Theory is a sludge/heavy metal/hard rock band from Perth, Scotland, active since 2017. Their music blends the crushing weight of sludge with classic heavy metal and hard rock sensibilities from the Fair City.

Triarchy is a NWOBHM/heavy metal band from Gravesend, Kent, formed in 2022. Their music channels the raw energy and twin-guitar attack of the New Wave of British Heavy Metal from the Thames Estuary.

Tributo al Cielo is a heavy metal band from Quintanar del Rey, Spain, active since 2010. Their name meaning "tribute to heaven," they play spiritual heavy metal.

Trinchera is a heavy metal band from Ribadesella, Spain, formed in 2022. Their name meaning "trench," they play battle-hardened heavy metal from the Asturian coast.

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.

Tristan is a melodic heavy metal/hard rock band from Osona, Spain, formed in 2018. They play accessible melodic metal from the Catalan interior.

Tritonus is a heavy metal band from Crevillent, Spain, formed in 2021. Named after the diabolical tritone interval, they channel dark-themed heavy metal.

Triumpher from Athens deliver heavy and power metal with the victorious energy their name demands since 2023. Their compositions channel the spirit of triumph from the city that invented the victory hymn.

Trixter is a heavy metal band from Middlesbrough, England, formed in 2010. They deliver traditional heavy metal with hard-hitting riffs and anthemic energy in the spirit of classic British steel.