Kasyldów [kaˈsɨlduf] is a village in the administrative district of Gmina Krzywda, within Łuków County, Lublin Voivodeship, in eastern Poland. It lies approximately 11 kilometres (7 mi) north-west of Krzywda, 24 km (15 mi) south-west of Łuków, and 74 km (46 mi) north-west of the regional capital Lublin.