Wietrzno [ˈvjɛtʂnɔ] (formerly German Vettrin) is a village in the administrative district of Gmina Polanów, within Koszalin County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately 5 kilometres (3 mi) south-west of Polanów, 35 km (22 mi) east of Koszalin, and 155 km (96 mi) north-east of the regional capital Szczecin.

For the history of the region, see History of Pomerania.

The village has a population of 100.