Marianka Siemieńska [maˈrjanka ɕɛˈmjɛɲska] is a village in the administrative district of Gmina Łęka Opatowska, within Kępno County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 4 kilometres (2 mi) south of Łęka Opatowska, 14 km (9 mi) south-east of Kępno, and 158 km (98 mi) south-east of the regional capital Poznań.