Kostkowice ([kɔstkɔˈvit͡sɛ]) is a village in Gmina Dębowiec, Cieszyn County, Silesian Voivodeship, southern Poland.

[1] The name of the village is patronymic in origin, derived from the personal name Kostka, ending with a typically Slavic -(ow)ice.

It was first mentioned in a Latin document of Diocese of Wrocław called Liber fundationis episcopatus Vratislaviensis from around 1305 as item in Goschegowitz debent esse XX mansi.

The creation of the village was a part of a larger settlement campaign taking place in the late 13th century on the territory of what would later be known as Upper Silesia.

Politically the village belonged initially to the Duchy of Teschen, formed in 1290 in the process of feudal fragmentation of Poland and was ruled by a local branch of Silesian Piast dynasty.