Osiny Dolne [ɔˈɕinɨ ˈdɔlnɛ] is a village in the administrative district of Gmina Mokobody, within Siedlce County, Masovian Voivodeship, in east-central Poland. It lies approximately 15 kilometres (9 mi) north-west of Siedlce and 81 km (50 mi) east of Warsaw.