Tri-Angle is the debut studio album by South Korean pop group TVXQ, released on October 11, 2004 by S.M. Entertainment. It sold 242,540 copies and became the eighth most successful album of the year in South Korea. The first single "Hug" debuted with 169,532 copies sold in 2004, peaking at number four on the national monthly chart. As of 2014, it sold 242,890 copies. In November 2004, the Japanese version of "Hug" was released in Japan by Rhythm Zone, ultimately selling 4,710 copies.

The second single, "The Way U Are" debuted at number two on the national chart and sold 214,069 copies. By the end of the year, the single sold 300,226 copies. The album's last title single "Tri-Angle" uses a sample from the Symphony No. 40 in G minor by Mozart. The single also features the vocals of BoA and rock band the TRAX.

Tri-Angle has sold approximately 309,000 copies as of 2011.

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