Olszowiec [ɔlˈʂɔvjɛt͡s] is a village in the administrative district of Gmina Brochów, within Sochaczew County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) south-east of Brochów, 10 km (6 mi) north-east of Sochaczew, and 47 km (29 mi) west of Warsaw.