Sobienie Kiełczewskie Pierwsze [sɔˈbjɛɲɛ kʲɛu̯ˈt͡ʂɛfskʲɛ ˈpjɛrfʂɛ] is a village in Otwock County, Gmina Sobienie-Jeziory.The population is near 200. In the village is Voivodship Road 801. It lies approximately 3 kilometres (2 mi) south-east of Sobienie-Jeziory, 23 km (14 mi) south of Otwock, and 41 km (25 mi) south-east of Warsaw.

From 1975 to 1998 this village was in Siedlce Voivodeship.