Yū Daiki is a Japanese voice actress and actress born on April 20, 1964, in Kyoto Prefecture, Japan. Her blood type is B. She began her entertainment career in 1984.

One of Daiki's most recognized voice roles is Daichi Kobayashi in the early 1990s magical girl anime series Hime-chan's Ribbon, which aired from 1992 to 1993. In the series, Daichi is a boy who discovers the main character Himeko's secret regarding her magical ribbon.

Daiki voiced the character Nanako Gen (also listed as Nanako Minamoto) in the 2005 anime series Capeta. Another notable role is Blackbeetle in the series Medabots Spirit, known in Japan as Medarot Damashii. Blackbeetle is a Death Medarot robot used by the character Kokuryuu and is equipped with a special medal that grants it thoughts and feelings.

In 1994, she provided the voice for Amakusa Shirō Tokisada in the animated television movie Samurai Shodown: The Motion Picture, also known as Samurai Spirits: Haten Gōma no Shō. Her other anime voice credits include the role of Kisaragi in the 2001 series Chance Triangle Session.

Beyond voice acting for animation, Daiki has also performed in video games. She voiced Kaoru Sayama in the 2006 title Yakuza 2 (Ryu ga Gotoku 2). Additionally, she has appeared as an actress in several Japanese television dramas.