Mayu Iino is a Japanese voice actress and former child actress born on May 23, 1999, in Saitama Prefecture, Japan. She began her career in entertainment as a child and made her anime voice acting debut in 2008 with a role in the series Michiko to Hatchin. She is affiliated with the talent agency Theatre Academy.

Iino has contributed voices to a range of anime television series and films. In the anime series Yumeiro Pâtissière and its sequel Yumeiro Pâtissière SP Professional, she provided the voice for the character Caramel. She voiced the character Ink in the 2010 animated film Welcome to the SPACE SHOW. More recently, she was part of the cast for the 2023 anime series Zenryoku Usagi, playing the role of Mikuro-san.

Her other voice roles include Yuma in Cooking Idol I! My! Main!, Sayaka in Usagi Drop, Shizuka Matsuo in Shiki, and a female student role in The Colors Within. She also contributed voice work to the film The Disappearance of Haruhi Suzumiya. Beyond anime, Iino has voiced characters in Japanese dubs of foreign films such as Snow Buddies and Santa Buddies, and has served as the narrator for promotional videos of the Story of Seasons video game series.