Košariská (Slovak pronunciation: [ˈkɔʂariskaː]; Hungarian: Kosaras) is a village and municipality in Myjava District in the Trenčín Region of north-western Slovakia.

Before the establishment of independent Czechoslovakia in 1918, it was part of Nyitra County within the Kingdom of Hungary.

The municipality lies at an altitude of 249 metres and covers an area of 11.531 km2.

The records for genealogical research are available at the state archive "Statny Archiv in Bratislava, Slovakia" Media related to Košariská at Wikimedia Commons

This Trenčín District location article is a stub.