Külköy is a village in the Karahallı District of the Uşak Province in Turkey, in the Aegean Region.

[2] It is about 4 km away from the town of Karahallı.

The village has a primary school.

[3] There is drinking water and a sewerage network.

[citation needed] The remains of a Byzantine church were discovered in Külköy at the end of the 20th century.