Osiecko [ɔˈɕɛt͡skɔ] is a village in the administrative district of Gmina Zębowice, within Olesno County, Opole Voivodeship, in south-western Poland. It lies approximately 4 kilometres (2 mi) north-east of Zębowice, 11 km (7 mi) south of Olesno, and 35 km (22 mi) east of the regional capital Opole.