Długa Szlachecka [ˈdwuɡa ʂlaˈxɛt͡ska] is a village in the administrative district of Gmina Halinów, within Mińsk County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) north-west of Halinów, 19 km (12 mi) north-west of Mińsk Mazowiecki, and 22 km (14 mi) east of Warsaw.