Mielno [ˈmjɛlnɔ] (German: Groß Möllen) is a large coastal village in Koszalin County, West Pomeranian Voivodeship, in north-western Poland. It is the seat of the gmina (administrative district) called Gmina Mielno. It lies approximately 12 kilometres (7 mi) north-west of Koszalin and 135 km (84 mi) north-east of the regional capital Szczecin.