Mio or MIO may refer to:
- "My" or "mine" in Italian and Spanish
- mio, a written abbreviation for "millions" as a unit indicator in the financial markets
- Mio, an abbreviation for Mebioctet (see Octet (computing)), a unit of information or computer storage
- MIO Biwako Kusatsu, a Japanese football club in Kusatsu, Shiga
- Mio Card, a company that sells debit cards for recurring payments
- Mio, Michigan, a town in the USA
- Mio, My Son, a children's book by Astrid Lindgren
- Mio Technology, a Taiwanese mobile electronics manufacturer
- mio TV, a pay-TV service by SingTel
- Yamaha Mio, a motorcycle made by Yamaha Motor
- Mío, song by Paulina Rubio
- MiO, a Kraft foods flavor product, marketed as a "liquid water enhancer"
- Fiat Mio - Urban Car
Read more about Mio: People, Fictional Characters, Acronym