Mio is a feminine Japanese given name. It may refer to:
People
- , Japanese model and actress
- , Japanese singer
- , Japanese actress
- , Japanese female announcer
- , Japanese professional wrestler
- , Japanese competitive swimmer
- , Japanese football player
- , Japanese gravure idol
- , Japanese actress, model and tarento
- , Japanese professional basketball
- , Japanese professional wrestler
- , Japanese politician
- , Japanese actress and singer
- , Japanese idol, a member of HKT48
- , Japanese kickboxer
- , Japanese female rugby union player
- Mio Yoshizumi, former member of the Japanese girl group Kamen Rider Girls
- , Japanese actress, model and tarento
Fictional characters
- Mio, protagonist of the book Mio, My Son by Astrid Lindgren and the film adaptation Mio in the Land of Faraway
- Mio, in the video game Grandia
- Mio, in the video game Xenoblade Chronicles 3
- Mio Akiyama, in the manga and anime series K-On!
- Mio Amakura, in the video game series Fatal Frame
- Mio Chibana, a main character in the manga series L'étranger
- Mio Honda, in the media franchise The Idolmaster
- Mio Ibuki, in the light novel series Classroom of the Elite
- Mio Kusakai, in the manga and anime series Keijo
- Mio Minato, in the anime series Aikatsu Friends!
- Mio Minato, in the tokusatsu series Ultraman R/B
- Mio Naganohara, a main character in the anime and manga series Nichijou
- Mio Naruse, in the light novel series The Testament of Sister New Devil
- Mio Natsume, in the tokusatsu series Ressha Sentai ToQger
- Mio Natsume, in the anime series Just Because!
- Mio Nishizono, in the visual novel Little Busters!
- Mio Ookami, a Japanese member of Hololive
- Mio Sakamoto, in the media franchise Strike Witches
- Mio Suzuki, in the tokusatsu series Kamen Rider Kiva, also known as the Pearlshell Fangire/Queen
- Mio Takamiya, in the light novel series Date A Live
- Mio Hudson, one of the two protagonists of the game Split Fiction