Kamiennik (Polish pronunciation: [kaˈmjɛɲːik]) is a village in Nysa County, Opole Voivodeship, in south-western Poland. It is the seat of the gmina (administrative district) called Gmina Kamiennik.

It lies approximately 17 kilometres (11 mi) north-west of Nysa and 57 km (35 mi) west of the regional capital Opole.