Ełk County (Polish: powiat ełcki) 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 only town is Ełk, which lies 123 kilometres (76 mi) east of the regional capital Olsztyn.

The county covers an area of 1,111.87 square kilometres (429.3 sq mi).

The county is subdivided into five gminas (one urban and four rural).