Radostów Dolny [raˈdɔstuf ˈdɔlnɨ] (German: Nieder Thiemendorf) is a village in the administrative district of Gmina Lubań, within Lubań County, Lower Silesian Voivodeship, in south-western Poland.

It lies approximately 3 kilometres (2 mi) north-east of Lubań, and 120 kilometres (75 mi) west of the regional capital Wrocław.