Vainio
Vainio is a Finnish surname for the following people:
- Aaro Vainio (* 1993), Finnish racing driver
- Juha Vainio (1938–1990), Finnish songwriter
- Martti Vainio (* 1950), Finnish athlete
- Mika Vainio (1963-2017), Finnish musician
- Nanna Vainio (* 1991), Finnish badminton player
