Kobylinek [kɔbɨˈlinɛk] is a village in the administrative district of Gmina Prostki, within Ełk County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) west of Prostki, 16 km (10 mi) south of Ełk, and 124 km (77 mi) east of the regional capital Olsztyn.