Karniszewo [karniˈʂɛvɔ] is a village in the administrative district of Gmina Mieleszyn, within Gniezno County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 5 kilometres (3 mi) south of Mieleszyn, 14 km (9 mi) north-west of Gniezno, and 47 km (29 mi) north-east of the regional capital Poznań.