Kőszegszerdahely is a village in Vas county, in the district of Kőszeg, 5 km-s from the Hungarian-Austrian border (Bozsok-Rohonc border crossing).

Neighboring settlements: Bozsok, Velem, Cák, Kőszegdoroszló and Perenye.

In the Middle Ages, villages belonged to a castle or a lordship.

In 1532, Turkish troops besieging Kőszeg together with the other villages in the area burned down Kőszegszerdahely.

The inhabitants of the villages fled to the Castle of Kőszeg and, together with the citizens of Kőszeg, led by Captain Miklós Jurisich, stopped the Turks.