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). As of 2006 its total population is 43,006, out of which the population of Lidzbark Warmiński is 16,390, that of Orneta is 9,380, and the rural population is 17,236.
The county is subdivided into five gminas (one urban, one urban-rural and three rural). These are listed in the following table, in descending order of population.