Von-Alten-Buche, Monumental beech tree in Von-Alten-Garten, Germany.

Von-Alten-Buche is a European beech (Fagus sylvatica) in the Von-Alten-Garten in Hannover-Linden, grown from three saplings twisted together and planted in one hole around 1835. Its single trunk measures over 6 metres in circumference at the base, the tree stands over 35 metres tall, and the crown spans more than 20 metres across.

The von Alten family repurchased the Rittergut Linden from the von Platen family in 1816 after more than a century, but leased it out until 1845. It was the tenants who, around 1835, planted three young red beeches twisted together in one planting hole. The trees fused into a single beech with a trunk circumference over 6 meters, a height over 35 meters, and a crown diameter over 20 meters.

The tree's name comes from the von Alten family, who repurchased the Linden estate in 1816 but leased it until 1845; the tenants planted the beeches around 1835. It stands in the former baroque garden parterre of Schloss Linden, now the Von-Alten-Garten, and has long been the garden's main landmark.

A protective fence surrounds the tree at a considerable distance to prevent visitors from getting too close due to falling branches caused by fungal infection. Visit on dry days when access to the nearby garden paths remains open and safe.

The three beeches were planted around 1835 by the tenants who leased the Linden estate, not by the von Alten family, who only took the property back into their own use in 1845. The trees were twisted together in one planting hole and fused into a single trunk. Since the early 2010s a fungal infection with the giant polypore has been killing the tree.