Leżajsk County (Polish: powiat leżajski) is a unit of territorial administration and local government (powiat) in Subcarpathian Voivodeship, south-eastern 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 Leżajsk, which lies 41 kilometres (25 mi) north-east of the regional capital Rzeszów.

The only other town in the county is Nowa Sarzyna, lying 11 km (7 mi) north-west of Leżajsk.

The county covers an area of 583.01 square kilometres (225.1 sq mi).