Toru Kitajima (北嶋徹), better known as TK, is a Japanese singer and the lead vocalist and guitarist of the Japanese rock band Ling tosite sigure. He was born on December 23, 1982 in Saitama Prefecture.

His music, both as a solo artist and with Ling tosite sigure, is characterised by frantic, technical rhythm guitar playing, frequent changes in tempo and dynamics, and a piercing, expressive falsetto singing voice.