Sztum County (Polish: powiat sztumski) is a unit of territorial administration and local government (powiat) in Pomeranian Voivodeship, northern Poland.

Its administrative seat and largest town is Sztum, which lies 56 kilometres (35 mi) south-east of the regional capital Gdańsk.

The only other town in the county is Dzierzgoń, lying 21 km (13 mi) east of Sztum.

The county was created, as a result of local pressure, in 2002.

The county covers an area of 730.85 square kilometres (282.2 sq mi).