Sierszeniska [ɕɛrʂɛˈniska] is a settlement in the administrative district of Gmina Szczecinek, within Szczecinek County, West Pomeranian Voivodeship, in north-western Poland.

It lies approximately 8 kilometres (5 mi) south-east of Szczecinek and 147 km (91 mi) east of the regional capital Szczecin.