Castle of the Order of St. John - a castle located in the village of Łagów (56 km south of Gorzów Wielkopolski), Lubusz Voivodeship; in Poland.

The castle is located on a peninsula between the Łagowski and Ciesz Lakes.

The castle was built by the Order of St. John, and in later years fortified in a trapezium-like shape.

In the eighteenth century the residence was reconstructed in the Baroque architectural style.

In 1812, after the secularisation of the Order of St. John, the castle went into private hands.