Sieczychy [ɕɛˈt͡ʂɨxɨ] is a village in the administrative district of Gmina Długosiodło, within Wyszków County, Masovian Voivodeship, in east-central Poland. It lies approximately 11 kilometres (7 mi) south-west of Długosiodło, 12 km (7 mi) north of Wyszków, and 63 km (39 mi) north-east of Warsaw.