Yoshiki Hayashi (Japanese: 林 佳樹, Hepburn: Hayashi Yoshiki, born November 20, 1965), known as Yoshiki, is a Japanese musician, songwriter, composer and record producer. He is best known as the leader and a co-founder of the visual kei rock band X Japan, for which he is the drummer, pianist and main songwriter. He has been described by Billboard as a "musical innovator" and named "one of the most influential composers in Japanese history" by Consequence of Sound. Yoshiki's solo career includes several classical studio albums and collaborations with artists such as George Martin, Bono, will.i.am, Jennifer Hudson, St. Vincent, Stan Lee, Roger Taylor and Brian May of Queen, Gene Simmons and KISS, Nicole Scherzinger, and Sarah Brightman.

In 1999, at the request of the Japanese government, he composed and performed a classical song at a celebration in honor of the tenth anniversary of Emperor Akihito's enthronement. Yoshiki also composed the theme for the 69th Golden Globe Awards as well as for several anime and film soundtracks including Attack on Titan and Saw IV.