Ruda Kościelna [ˈruda kɔɕˈt͡ɕɛlna] is a village in the administrative district of Gmina Ćmielów, within Ostrowiec County, Świętokrzyskie Voivodeship, in south-central Poland. It lies approximately 7 kilometres (4 mi) north of Ćmielów, 11 km (7 mi) east of Ostrowiec Świętokrzyski, and 66 km (41 mi) east of the regional capital Kielce.