Kosarzew Dolny [kɔˈsaʐɛf ˈdɔlnɨ] is a village in the administrative district of Gmina Krzczonów, within Lublin County, Lublin Voivodeship, in eastern Poland. It lies approximately 8 kilometres (5 mi) west of Krzczonów and 30 km (19 mi) south of the regional capital Lublin.