Mońki County (Polish: powiat moniecki) is a unit of territorial administration and local government (powiat) in Podlaskie Voivodeship, northeastern 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 Mońki, which lies 40 kilometres (25 mi) northwest of the regional capital Białystok.

The county also contains the towns of Knyszyn, lying 13 km (8 mi) southeast of Mońki, and Goniądz, 11 km (7 mi) northwest of Mońki.

The county covers an area of 1,382.39 square kilometres (533.7 sq mi).