Tetsuya, Japanese singer-songwriter, bass player, and producer
Tetsuya (テツヤ, born 3 October 1969) is a Japanese musician, best known as the leader and bassist of the rock band L'Arc-en-Ciel. Formerly known by the stage name tetsu, he started using his birth name professionally on December 1, 2009. While in L'Arc-en-Ciel his name is stylized as tetsuya, whereas in his solo work it is stylized as TETSUYA.

He also does backup vocals in L'Arc-en-Ciel and has composed many of the band's songs, including "Link", "Ready Steady Go", "Finale", "Driver's High", "Stay Away", "Pieces" and "Good Luck My Way". In 2001 he started a solo career under the name TETSU69 (1969 is his birth year). From 2005 to 2006 he was a support member of Morrie's solo project Creature Creature.