Zajączkowo is a village in the administrative district of Gmina Tczew, within Tczew County, Pomeranian Voivodeship, in northern Poland. It lies approximately 3 km north of Tczew and 28 km south of the regional capital Gdańsk. It is located within the ethnocultural region of Kociewie in the historic region of Pomerania. Zajączkowo was a royal village of the Polish Crown, administratively located in the Tczew County in the Pomeranian Voivodeship. For details of the history of the region, see History of Pomerania.