Takahiro Moriuchi, known professionally as Taka, is a Japanese musician and the lead vocalist of the band ONE OK ROCK. Taka signed with Johnny's Entertainment in August 2001 at age 13. He joined as a trainee in the group called Johnny's Junior and made some singing appearances on Japanese music shows during this period. In September 2003, two years after joining the agency, Taka was one of the Johnny's Juniors chosen to be part of the idol group NEWS. However, his activities were suspended when he left the agency and the group in December of the same year. Taka was invited by guitarist Toru Yamashita to join ONE OK ROCK in 2005. The band released their first independent CD in 2006 and were signed by Amuse, Inc., with whom they made their major debut. In 2017, Kerrang! magazine placed Taka at number 27 on their list of the "50 Greatest Rockstars in the World". He was also listed by Rock Sound magazine as one of the "50 Most Influential Figures in Rock". In 2025, he contributed to the original soundtrack of the Netflix original series Glass Heart.
