Młynarski is a Polish surname meaning Miller (surname). Notable people with the surname include:
- Danuta Hübner née Młynarska (born 1948), Polish politician
- Emil Młynarski (1870–1935), Polish conductor
- Feliks Młynarski (1884–1972), Polish banker, philosopher and economist
- Mieczysław Młynarski (born 1956), Polish basketball player
- Nela Młynarska, ballerina, Arthur Rubinstein wife
- Tomasz Młynarski (born 1977), Polish political scientist
- Wojciech Młynarski (1941–2017), Polish musician