Czubajowizna [t͡ʂubajɔˈvizna] is a village in the administrative district of Gmina Poświętne, within Wołomin County, Masovian Voivodeship, in east-central Poland. It lies approximately 11 kilometres (7 mi) east of Wołomin and 31 km (19 mi) north-east of Warsaw.