Hieronimów [xjɛrɔˈnimuf] is a village in the administrative district of Gmina Sienno, within Lipsko County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) east of Sienno, 12 km (7 mi) south-west of Lipsko, and 132 km (82 mi) south of Warsaw.