The Royal castle in łęczyca is a medieval castle located in the Wielkopolskie Voivodeship. The fortress was built by order of Casimir III the Great in 1357-1370.

A fortification was built on a hill and surrounded by a moat filled with water. The brick building was defended by a wall 10 meters high, with an octagonal towers. The castle occupied an area of 2600 sq. m. In the courtyard of the castle there was a barn and a warehouse of weapons.

After completion of construction, the castle became the permanent residence of king Casimir the Great. In the early fifteenth century it suffered at the hands of the Teutonic knights, who built the castle arson. In subsequent years, in the castle prison were concluded, many of the Teutonic knights. In the second half of the fifteenth century, the fortress was taken by the king Casimir IV.

After a great fire in the second half of the 15th century, the castle remained in ruins until the beginning of the 1560-ies. In 1565 it was completely rebuilt Treasurer of the crown Jan Lutomirski at the expense of the state Treasury. In the seventeenth century the castle was again destroyed during the Swedish attack. During the following years the locals used the remains of the castle as a source of building materials.

After the Second world war the castle became the residence of the scout troop, and in 1964 began its reconstruction. Today in the Royal castle there is a Museum.