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

Its administrative seat and only town is Olecko, which lies 135 kilometres (84 mi) east of the regional capital Olsztyn.

When powiats were re-introduced in the Polish local government reforms of 1999, the present Gołdap and Olecko Counties made up a single entity (called powiat olecko-gołdapski or Olecko-Gołdap County).

The county covers an area of 873.83 square kilometres (337.4 sq mi).

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