Zielona [ʑɛˈlɔna] is a village in the administrative district of Gmina Ojrzeń, within Ciechanów County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) south of Ojrzeń, 18 km (11 mi) south of Ciechanów, and 63 km (39 mi) north-west of Warsaw.