Dziekanów Leśny [d͡ʑɛˈkanuf ˈlɛɕnɨ] is a village in the administrative district of Gmina Łomianki, within Warsaw West County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) north-west of Łomianki, 16 km (10 mi) north of Ożarów Mazowiecki, and 18 km (11 mi) north-west of Warsaw.