Napoleon Oak, Historical oak tree at University of Lausanne, Switzerland.

The Napoleon Oak is a pedunculate oak (Quercus robur) on the Dorigny campus of the University of Lausanne. Its trunk measures 6.75 metres in circumference and the tree stands 35 metres tall. Because of its age, 140 metres of cables support its limbs. It was replanted in 1800 when it was 22 years old.

Dendrochronology showed the oak germinated around 1778, so it was about 22 years old when replanted in 1800 at the centre of the Dorigny estate. Étienne-François-Louis de Loys, then owner of the estate, is said to have planted it after Napoleon reviewed 40,000 troops at Saint-Sulpice on 12 May 1800. The tree was kept when the University of Lausanne moved to Dorigny and became its emblem.

The oak was reportedly planted by Étienne-François-Louis de Loys, owner of the Dorigny estate, after Napoleon reviewed 40,000 troops at Saint-Sulpice on 12 May 1800. The University of Lausanne later adopted the tree as its emblem, and it still stands at the centre of the Dorigny campus.

The tree is freely accessible on the university campus and easy to reach on foot without special permissions required. The best time to visit is during university hours when the grounds are open and well-frequented.

In 2017 the entire genetic code of the tree was sequenced to study genetic mutations, leading to breakthrough insights about how ancient trees remain biologically stable. The study revealed surprisingly low mutation rates that changed understanding of how trees survive over centuries.