Lidzbark County (Polish: powiat lidzbarski) is a unit of territorial administration and local government (powiat) in Warmian-Masurian Voivodeship, northern Poland.

Its administrative seat and largest town is Lidzbark Warmiński, which lies 38 kilometres (24 mi) north of the regional capital Olsztyn.

The only other town in the county is Orneta, lying 30 km (19 mi) west of Lidzbark Warmiński.

The county covers an area of 924.42 square kilometres (356.9 sq mi).

Lidzbark County came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998.