Biernacice [bjɛrnaˈt͡ɕit͡sɛ] is a village in the administrative district of Gmina Sieroszewice, within Ostrów Wielkopolski County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 16 kilometres (10 mi) south-east of Sieroszewice, 33 km (21 mi) south-east of Ostrów Wielkopolski, and 128 km (80 mi) south-east of the regional capital Poznań.