Sierosławek [ɕɛrɔˈswavɛk] is a village in the administrative district of Gmina Drzycim, within Świecie County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 7 kilometres (4 mi) north of Drzycim, 18 km (11 mi) north of Świecie, and 55 km (34 mi) north-east of Bydgoszcz.