Hradčany, the Castle District (), is the Prague district surrounding Prague Castle.

The castle is said to be the biggest castle in the world at about 570 meters length and an average of about 130 meters wide. Its history stretches back to the 8th century. The St Vitus Cathedral is located in the castle area.

Hradčany was an independent borough until 1784, when the four independent boroughs that had formerly constituted Prague were proclaimed a single city. The other three were Malá Strana, Staré Město and Nové Město .