Unin [ˈunin] is a village in the administrative district of Gmina Górzno, within Garwolin County, Masovian Voivodeship, in east-central Poland. It lies approximately 8 kilometres (5 mi) north of Górzno, 5 km (3 mi) east of Garwolin, and 59 km (37 mi) south-east of Warsaw.