Tatoi Palace, Royal palace in Mount Parnitha, Greece.

Tatoi Palace is a royal estate on the southeast slope of Mount Parnitha north of Athens in Greece. The property spreads over many hectares and includes main buildings, outbuildings, gardens and a necropolis for members of the Greek royal family.

George I of Greece acquired the land in 1872 and gradually developed it into a summer residence for the royal family. After the monarchy ended in 1974 the estate remained unused for decades and fell into disrepair.

The name probably comes from the Albanian-Vlach chieftain Tatoi, not from a Turkish word. The estate's ancient name is Dekeleia, and the area was an Ottoman chiflik before Alexandros Kantakouzinos sold it to the Soutsos family. The first building completed was the church of Profitis Ilias in 1873, with its sawtooth brick decoration.

Access is through two entrances off the main road, and visitors can explore further areas on foot along unpaved paths. Due to heavy damage to the structures entry to many rooms is currently not possible.

The 2021 fire burned 16,997 hectares of the estate and broke out in the palace itself, which was saved, but two adjoining storage containers of objects were destroyed. The Royal Cemetery area burned while the Mausoleum and the Church of the Resurrection survived. The Directorate building, the caretaker's house, the Telegraph Office and Sturm House were lost.