Marcinków [marˈt͡ɕiŋkuf] is a village in the administrative district of Gmina Żarnów, within Opoczno County, Łódź Voivodeship, in central Poland. It lies approximately 5 kilometres (3 mi) south-west of Żarnów, 22 km (14 mi) south-west of Opoczno, and 79 km (49 mi) south-east of the regional capital Łódź.