Sierakowo-Kolonia is a village in the administrative district of Gmina Kobylnica, within Słupsk County, Pomeranian Voivodeship, in northern Poland. It lies approximately 6 kilometres (4 mi) south of Kobylnica, 9 km (6 mi) south of Słupsk, and 107 km (66 mi) west of the regional capital Gdańsk.