Grębki [ˈɡrɛmpki] is a village in the administrative district of Gmina Wąsewo, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately 12 kilometres (7 mi) south of Wąsewo, 13 km (8 mi) west of Ostrów Mazowiecka, and 80 km (50 mi) north-east of Warsaw.