Mielnik is a village and municipal seat in Podlaskie Voivodeship, north-east Poland.
Mielnik may also refer to the following places: Mielnik, Lower Silesian Voivodeship (south-west Poland) Mielnik, Subcarpathian Voivodeship (south-east Poland) Mielnik, West Pomeranian Voivodeship (north-west Poland) Gail McIntyre, Character in Coronation Street