The Muscovite Civil War or the Great Feudal War is a prolonged conflict that casts its shadow over the entire reign of Vasily II of Moscow (from 1425 to 1453).

The two warring parties are Vasily II, the Grand Prince of Moscow, as one party, and his uncle, Yury Dmitrievich, the Prince of Zvenigorod, and the sons of Yuri Dmitrievich, Vasily Kosoy and Dmitry Shemyaka, as the other party.

At the intermediate stage, the party of Yury conquers Moscow, but at the end Vasily II regains his crown.

This is the first civil war in the history of Muscovy, whose largely peaceful rise had been predicated on a lack of conflict within the ruling family.