Stronie Śląskie [ˈstrɔɲɛ ˈɕlɔ̃skʲɛ] (German: Seitenberg) is a town in Kłodzko County, Lower Silesian Voivodeship, in south-western Poland. It is the seat of the administrative district (gmina) called Gmina Stronie Śląskie, close to the Czech border. It is located within the historic Kłodzko Land. As of 2019, the town has a population of 5,709.