Tczew County (Polish: powiat tczewski) is a unit of territorial administration and local government (powiat) in Pomeranian Voivodeship, northern Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Tczew, which lies 31 kilometres (19 mi) south of the regional capital Gdańsk. The county also contains the towns of Pelplin, lying 20 km (12 mi) south of Tczew, and Gniew, 31 km (19 mi) south of Tczew. The county is part of the area traditionally inhabited by the Kociewiacy ethnic group.
The county covers an area of 697.54 square kilometres (269.3 sq mi). As of 2006 its total population is 112,614, out of which the population of Tczew is 60,263, that of Pelplin is 8,486, that of Gniew is 6,787, and the rural population is 37,078.