Rzekuń [ˈʐɛkuɲ] is a village in Ostrołęka County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Rzekuń. It lies approximately 5 kilometres (3 mi) south-east of Ostrołęka and 102 km (63 mi) north-east of Warsaw.