Körösnagyharsány (Körös-Nagy-Harsány) is a village in Békés County, in the Southern Great Plain region of south-east Hungary.

Körösnagyharsány was first mentioned at the beginning of the 14th century in book Váradi Regestrum, in which one of the inhabitants of the village was summoned to an ordeal.

[citation needed] After the destruction, the village was rebuilt on the left bank of the river Sebes-Körös, since when the city lies at its present place.

The settlement was mentioned later as Nagy- és Kisharsány (Large and Small Harsány) as a land of Capital Cathedral of Nagyvárad (present Oradea, Romania), that was still possessed it at the first half of the 19th century.

After being cut from Nagyvárad, losing its trade and human connections with its vital city, started a process of depopulation.

After the Treaty of Trianon the Jewish community slowly started to diminish, and then their fate was sealed by the Holocaust.