Coco Hayashi (林 鼓子, Hayashi Koko; born 15 May 2002) is a Japanese actress who specializes in voice acting. She voiced Ayumi Hayashi in Wake Up, Girls! New Chapter! and Mirai Momoyama in Kiratto Pri Chan.

Hayashi was born in Hamamatsu, Shizuoka Prefecture, to an anime-loving father. She was a member of Space Craft Junior as a child and appeared in Oha Suta by 2013. She participated in a live event of voice actress Nana Mizuki and aspired to be a voice actress influenced by her performance. After receiving the recommendation of her father, she successfully auditioned in 2017 avex×81produce Wake Up, Girls! AUDITION. Her career started when she starred as Ayumi Hayashi in the 2017 Wake Up, Girls! spinoff New Chapter!, and she formed the unit Run Girls, Run! with Yuuka Morishima and Nanami Atsugi. In 2018, she voiced the lead character of Kiratto Pri Chan, Mirai Momoyama, and she starred in King of Prism: Shiny Seven Stars as Nagisa Takahashi. She also won the Best New Actress Award at the 13th Seiyu Awards alongside Kaede Hondo, Rina Honnizumi, Manaka Iwami, and Tomori Kusunoki.

Hayashi became involved with the Love Live! franchise in 2019, when she voiced a schoolgirl in the Love Live! Sunshine!! film. On 25 March 2023, she was revealed as the new voice actress of Setsuna Yuki from Nijigasaki High School Idol Club, succeeding Tomori Kusunoki.

On 2 April 2025, she announced her departure from mitt management after her contract expired.