Kosumce [kɔˈsumt͡sɛ] is a village in the administrative district of Gmina Karczew, within Otwock County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 12 kilometres (7 mi) south of Karczew, 15 km (9 mi) south of Otwock, and 32 km (20 mi) south-east of Warsaw.

Voivodeship Road 799 runs through the village.

Neighbouring villages include Dziecinów, Ostrówek and Piotrowice.

This Otwock County location article is a stub.