The Lavra fortification (Ukrainian: Лаврські фортифікаційні споруди, romanized: Lavrs’ki fortyfikatsiini sporudy; Russian: Лаврские фортификационные укрепления, romanized: Lavrskie fortifikatsionnye ukrepleniya) is a system of walls, towers and other constructions built for the protection of the Cave Monastery in Kyiv, the capital of Ukraine.

In 1679, Hetman Ivan Samoylovych had a moat and new ramparts added to the fortification around the "upper monastery."

Hetman Ivan Mazepa financed the fortification's construction at the height of the Great Northern War, and had a thick stone wall with four towers added for protection of the monastery in case of Swedish attack.

It was completed in 1723, and consisted of a semicircular citadel with a 6 metre high earthen rampart, eight bulwarks, and other fortifications.

During that time, the Old Cave Fortress constructed in the 18th century was the base for the administrative and military institutions of the Russian Empire in the city.