Kreva Castle (Belorussian: Крэўскі замак) is the ruins of a major fortified residence of Grand Dukes Gediminas and Algirdas in Kreva village, Belarus. Algirdas's brother Kęstutis was imprisoned and murdered in Kreva Castle in 1382.
The Act of Krewo, the first step towards the Commonwealth of Poland-Lithuania, was signed in the castle three years later. The castle was sacked by the Crimean Tatars in the early 16th century and stood unoccupied for a long time. By the 19th century, much of the walls had crumbled away. The First World War dealt a final blow to the decaying structure.
