Sionna [ˈɕɔnna] is a village in the administrative district of Gmina Kotuń, within Siedlce County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) north-west of Kotuń, 18 km (11 mi) west of Siedlce, and 70 km (43 mi) east of Warsaw.