The Dunajec river castles is a chain of thirteen medieval castles, built in southern Lesser Poland, along the Dunajec river. The castles protected the border between the Kingdom of Poland and the Kingdom of Hungary, as well as a very important international trade route, which went along the Dunajec and the Poprad all the way down to the Danube river. Most of the castles are in ruins now, and some have disappeared. Their history dates back to the period known as the Fragmentation of Poland in the early 12th century, when, according to his will, known as the Testament of Bolesław III Wrymouth, the country was divided into several provinces. The Dunajec river castles were located on the territory of two castellanies, Wojnicz and Nowy Sącz, in the extreme south of the Seniorate Province.

Wojnicz is an ancient historic town in Tarnów County, Lesser Poland Voivodeship. In the early medieval period of the Polish state, it became one of the most important centres in the province of Lesser Poland, as part of the system of Dunajec river castles. It became the seat of a Castellan and prospered from the 13th century to the first half of the 17th century, being on an international trade route bordering Hungary and the Ottoman Empire. It had town and market rights, its church was raised to collegiate status with links to the Jagiellonian University in Kraków 64 km away.