Osmolin is a village in the administrative district of Gmina Sanniki, within Gostynin County, Masovian Voivodeship, in central Poland.
The village is the site of the Osmolin Radio Tower.
Osmolin was granted Cheà Âmno town rights modeled after Gàbin in 1439. It was a royal town of Poland, administratively located in the Gàbin County in the Rawa Voivodeship in the Greater Poland Province.