Kirsztajnów [kirʂˈtai̯nuf] is a village in the administrative district of Gmina Kampinos, within Warsaw West County, Masovian Voivodeship, in east-central Poland. It lies approximately 10 kilometres (6 mi) west of Kampinos, 34 km (21 mi) west of Ożarów Mazowiecki, and 47 km (29 mi) west of Warsaw.