Sielce [ˈɕɛlt͡sɛ] is a village in the administrative district of Gmina Sanniki, within Gostynin County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) east of Sanniki, 32 km (20 mi) east of Gostynin, and 75 km (47 mi) west of Warsaw.