Tribulation is a heavy metal band from Waukesha, Wisconsin, formed in 2013, rooted in traditional heavy metal songwriting with a straightforward, riff-focused approach.

Trick or Treat is a heavy metal and hard rock band from Los Angeles, California, formed in 2025, drawing on classic metal and rock traditions from one of America's most storied hard rock scenes.

Tridium is a melodic heavy metal band from Clear Lake, Texas, formed in 2013, crafting guitar-driven compositions with an emphasis on melody and clean songwriting rooted in the Houston area metal scene.

TriggerEffect is a heavy metal and hard rock band from Lodi, California, formed in 2007, rooted in straightforward guitar-driven rock and metal from the Central Valley.

Trihexyn is a heavy/power/thrash metal band from Gaithersburg, Maryland, formed in 2009, drawing equally from traditional heavy metal, melodic power metal, and thrash aggression.

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.