Grubsko [ˈɡrupskɔ] is a village in the administrative district of Gmina Nowy Tomyśl, within Nowy Tomyśl County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 6 kilometres (4 mi) south-west of Nowy Tomyśl and 60 km (37 mi) west of the regional capital Poznań.