Osmolin Masovian Voivodeship
 Osmolin [ɔsˈmɔlin] is a village in the administrative district of Gmina Sanniki within Gostynin County Masovian Voivodeship in east-central Poland. It lies approximately 5 kilometres (3 mi) south of Sanniki 29 km (18 mi) south-east of Gostynin and 80 km (50 mi) west of Warsaw.The village has a population of 570.