Yū Wakui (和久井優, Wakui Yū, born 24 January 1995) is a Japanese voice actress affiliated with Mitt Management talent agency. She studied ballet from a young age, which helped create an interest in theatre and performance. During high school, she began the theatrical studies that led her to become a voice actor.

Her debut role in voice acting was in 2014 as Sumire Hikami, one of the main characters in the Aikatsu!. In 2016, she voiced Yōko Nishikawa, one of the three protagonists in Three Leaves, Three Colors. She was cast in 2020 as Toru Asakura in The Idolmaster Shiny Colors series of singing video games, and has had over 15 musical album releases as that character. Many of these Idolmaster Shiny Colors albums charted highly on the Oricon music charts.

Wakui played the lead role of Shiori Goshiki (opposite Taku Yashiro as Ichiro Kuga) in the 2023 anime adaptation of A Galaxy Next Door.