Old City of Zamosc is the oldest historic district of the city of Zamosc. It is one of World Heritage Sites in Poland (added in 1992). According to UNESCO, this monument value lies in it being "an outstanding example of a Renaissance planned town of the late 16th century, which retains its original layout and fortifications and a large number of buildings of particular interest, blending Italian and Central European architectural traditions.". The Medieval Town has an area of 75 ha and a buffer zone of 200 ha.
The district was named one of Poland's official national Historic Monuments (Pomnik historii), as designated September 16, 1994. Its listing is maintained by the National Heritage Board of Poland.