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

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

Its administrative seat and largest town is Pisz, which lies 88 kilometres (55 mi) east of the regional capital Olsztyn.

The county covers an area of 1,776.17 square kilometres (685.8 sq mi).

The county is subdivided into four gminas (all urban-rural, centred on the four towns).