Bytonia [bɨˈtɔɲa] is a village in the administrative district of Gmina Zblewo, within Starogard County, Pomeranian Voivodeship, in northern Poland. It lies approximately 4 kilometres (2 mi) south-west of Zblewo, 18 km (11 mi) west of Starogard Gdański, and 55 km (34 mi) south-west of the regional capital Gdańsk. It is located within the ethnocultural region of Kociewie in the historic region of Pomerania.

Bytonia was a royal village of the Polish Crown, administratively located in the Tczew County in the Pomeranian Voivodeship. It was annexed by Prussia in the First Partition of Poland in 1772, and restored to Poland, after Poland regained independence in 1918.