Triskelion is a heavy metal and hard rock band from Phoenix, Arizona, formed in 2012, rooted in classic heavy metal songcraft with an emphasis on melody and traditional song structure.

Triton is a death metal band from Laredo, Texas, formed in 2023, bringing brutal heaviness from the Texas-Mexico borderlands.

Triumvir is a New York epic heavy/power metal band formed in 2020, constructing grand, anthem-driven metal rooted in the classic European power metal and traditional heavy metal traditions.

Trivium is one of the most prominent American metal acts of the 2000s, formed in Orlando, Florida, known for bridging metalcore, thrash, and heavy metal across a commercially successful and critically recognized discography that includes albums such as Ascendancy, Shogun, and The Sin and the Sentence.

Trollfat is a California-based blackened heavy metal act formed in 2024, fusing the raw aggression of black metal with the driving, riff-forward energy of traditional heavy metal.

Trouble formed in Aurora, Illinois in 1979 and are widely recognized as one of the founding acts of American doom metal, often grouped alongside Candlemass, Pentagram, and Saint Vitus. Their first two albums, Psalm 9 (1984) and The Skull (1985), are landmark recordings that grafted Black Sabbath's heaviness onto a spiritual lyrical framework. The band signed to Rick Rubin's Def American label for their 1990 self-titled album and continued recording across eight studio releases.

Troupe is a Missouri heavy metal and hard rock band formed in 2012, drawing on classic heavy metal and rock traditions.

Troupe is a heavy metal and hard rock band from Shreveport, Louisiana, formed in 2012, rooted in the hard-rocking end of traditional metal.

Trox is a Newark, New Jersey heavy metal and hard rock outfit formed in 2018, building on the muscular riff vocabulary of classic heavy metal with a modern edge.