Mayu Watanabe

is a Japanese retired singer and actress. Nicknamed , her entertainment career was associated with the idol girl group AKB48 under Team B. In the annual AKB48 General Elections event, she had consistently been voted by fans to rank among the group's top members. She has released five solo singles, many of which have peaked in the top ten on the Oricon charts, and one solo album.

She left the group on the last day of 2017 and the first day of 2018, and pursued an acting career until she retired from the entertainment industry in June 2020.